## Q&A - PSLE Math

### Re: Q&A - PSLE Math

Hi, ps help..tks and God Bless:)

Lynnette bought 6 brushes and 2 boxes of poster colors. She gave $103.40 to the cashier and received a change of $25. Given that 8 brushes and a box of poster colors cost the same as 3 brushes and 2 boxes of poster colours, what is the cost of 5 boxes of poster colours.

Lynnette bought 6 brushes and 2 boxes of poster colors. She gave $103.40 to the cashier and received a change of $25. Given that 8 brushes and a box of poster colors cost the same as 3 brushes and 2 boxes of poster colours, what is the cost of 5 boxes of poster colours.

- PiggyLalala
- KiasuGrandMaster
**Posts:**4053**Joined:**Tue May 24,**Total Likes:**23

### Re: Q&A - PSLE Math

SOS mum wrote:Hi, ps help..tks and God Bless:)

Lynnette bought 6 brushes and 2 boxes of poster colors. She gave $103.40 to the cashier and received a change of $25. Given that 8 brushes and a box of poster colors cost the same as 3 brushes and 2 boxes of poster colours, what is the cost of 5 boxes of poster colours.

8 brushes and one poster color cost the same as 3 brushes and 2 boxes of poster colours....

means cost of 5 brushes = cost of one poster colour.

6 brushes + 2 boxes of poster colours = 103.40 -25= 78.40

6 brushes +2x5 brushes = 78.40

16 brushes = 78.40/16 =4.90

5 boxes of poster colours = 4.9×5×5= 122.50

### Re: Q&A - PSLE Math

Sorry, ps help the following too. Many tks and God Bless:)

(1) Welsona has some money. She spent $17.40 on 3 notebooks and 8 highlighters. He is short of 80cents if he were to buy another notebook. However, if he were to buy another highlighter, he will have 60cents left.

(a) Find the cost of a notebook.

(b) How much money does Welson have?

(2) Xania and Criven cycle from Town A to Town B which is 87.5km apart. Xania cycles at a speed of 27 km/h and Criven cycles at a speed of 35 km/h.

(a) If Xania starts cycling 40 minutes earlier than Criven, how long will Criven take to catch up with her.

(b) How far away is Xania from Town B when Criven arrives at Town B

(3) During an interclass game, each group of pupils had to collect as many colored balls as possible from a box. Each colour represents a certain number of points as shown below.

Yellow 4

green 3

red 5

The number of yellow balls in the box was 20% more than the number of red balls and 10% less than the number of green balls. If a group of pupils managed to collect all the balls and the total possible points was 1035, how many yellow and red balls were there in the box altogether.

(1) Welsona has some money. She spent $17.40 on 3 notebooks and 8 highlighters. He is short of 80cents if he were to buy another notebook. However, if he were to buy another highlighter, he will have 60cents left.

(a) Find the cost of a notebook.

(b) How much money does Welson have?

(2) Xania and Criven cycle from Town A to Town B which is 87.5km apart. Xania cycles at a speed of 27 km/h and Criven cycles at a speed of 35 km/h.

(a) If Xania starts cycling 40 minutes earlier than Criven, how long will Criven take to catch up with her.

(b) How far away is Xania from Town B when Criven arrives at Town B

(3) During an interclass game, each group of pupils had to collect as many colored balls as possible from a box. Each colour represents a certain number of points as shown below.

Yellow 4

green 3

red 5

The number of yellow balls in the box was 20% more than the number of red balls and 10% less than the number of green balls. If a group of pupils managed to collect all the balls and the total possible points was 1035, how many yellow and red balls were there in the box altogether.

### Re: Q&A - PSLE Math

(1) each notebook costs $1.40 more than a highlighter.SOS mum wrote:Sorry, ps help the following too. Many tks and God Bless:)

(1) Welsona has some money. She spent $17.40 on 3 notebooks and 8 highlighters. He is short of 80cents if he were to buy another notebook. However, if he were to buy another highlighter, he will have 60cents left.

(a) Find the cost of a notebook.

(b) How much money does Welson have?

(2) Xania and Criven cycle from Town A to Town B which is 87.5km apart. Xania cycles at a speed of 27 km/h and Criven cycles at a speed of 35 km/h.

(a) If Xania starts cycling 40 minutes earlier than Criven, how long will Criven take to catch up with her.

(b) How far away is Xania from Town B when Criven arrives at Town B

(3) During an interclass game, each group of pupils had to collect as many colored balls as possible from a box. Each colour represents a certain number of points as shown below.

Yellow 4

green 3

red 5

The number of yellow balls in the box was 20% more than the number of red balls and 10% less than the number of green balls. If a group of pupils managed to collect all the balls and the total possible points was 1035, how many yellow and red balls were there in the box altogether.

11u--> 13.20

1u--> !.20

Notebook--> 1.20+1.40=2.60

Amount he has --> 17.40 + (2.60- 0.8) = $19.20

(3) R : Y : G

100 120

90 100

30 : 36 : 40

30u(5) + 36u(4) + 40u(3) = 1035

U=2.5

Y+ R --> 66u --> 165

### Re: Q&A - PSLE Math

2a) Xania had a head start of 40/60 X 27 = 18kmSOS mum wrote:Sorry, ps help the following too. Many tks and God Bless:)

(2) Xania and Criven cycle from Town A to Town B which is 87.5km apart. Xania cycles at a speed of 27 km/h and Criven cycles at a speed of 35 km/h.

(a) If Xania starts cycling 40 minutes earlier than Criven, how long will Criven take to catch up with her.

(b) How far away is Xania from Town B when Criven arrives at Town B

Criven is 8 km/h faster than Xania.

To close the gap of 18km at 8km/h,

Time take for Criven to catch up will be 18/8 = 2.25hrs

or 2 hours and 15 mins #

b)

Time taken for Criven to reach town B = 87.5/35 = 2.5hrs

In that same time, Xania's distance will be (27 X 2.5 ) + 18 = 85.5km

Therefore Xania's distance from town B = 87.5 - 85.5 = 2km#

### Re: Q&A - PSLE Math

sushi88 wrote:In June, G ->u, B-> u+940ozora wrote:Need some guide on the following question.

In June , 940 more boys than girls went to the library.

In July, the number of girls increased by 35% while the boys decreased by 15%.

If 1943 children visited in July, how many boys visited the library?

thanks

In July, G -> 1.35u, B->0.85(u+940)

1.35u + 0.85u + 799 -> 1943

2.2u -> 1144

u -> 520

Boys visited library in July -> (520+940)0.85 = 1241

Thanks. Appreciate

### Re: Q&A - PSLE Math

May I know is there any other alternative method to find 2 to power of 20 besides using calculator?

Any short cut method or formula?

Any short cut method or formula?

### Re: Q&A - PSLE Math

Hi! need some help here. Thanks!

What is the digit in the ones place in the product of the following

9x99x999x9999x99999x999999x9999999

x99999999x999999999

What is the digit in the ones place in the product of the following

9x99x999x9999x99999x999999x9999999

x99999999x999999999

- alfretztay
- KiasuGrandMaster
**Posts:**1199**Joined:**Sun Sep 12,**Total Likes:**5

### Re: Q&A - PSLE Math

The digits in the ones place are as follows :Nickal wrote:Hi! need some help here. Thanks!

What is the digit in the ones place in the product of the following

9x99x999x9999x99999x999999x9999999

x99999999x999999999

9 -------> 9

9 x 9 -------> 1

9 x 9 x 9 -------> 9

9 x 9 x 9 x 9 -------> 1

...

9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 -------> 9

Ans : 9.

### Re: Q&A - PSLE Math

Don't really have any smart ideas, but you can try...ozora wrote:May I know is there any other alternative method to find 2 to power of 20 besides using calculator?

Any short cut method or formula?

2^20

= 4^10

= 16^5

= 16*16*16*16*16