Q&A - PSLE Math

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ozora
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Re: Q&A - PSLE Math

Post by ozora » Fri Apr 29, 2016 11:39 pm

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

sushi88
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Re: Q&A - PSLE Math

Post by sushi88 » Sat Apr 30, 2016 12:25 am

ozora 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 June, G ->u, B-> u+940
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

wilburlim
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Re: Q&A - PSLE Math

Post by wilburlim » Sat Apr 30, 2016 10:41 am

Hello, I need help with these questions. Really appreciate your assistance!

1. Mrs Koh bought some toys. She spent 1/4 of the money on a doll and the rest on 4 identical toy cars of the same price. She paid $4.50 more for a doll than on a toy car. How much did she spend on each toy car.


2. Alan and Berny have 336 cards altogether. 1/4 of Alan's cards is 12 more than 1/5 of Berny's cards. How many cards does Berny have?

sushi88
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Re: Q&A - PSLE Math

Post by sushi88 » Sat Apr 30, 2016 11:24 am

wilburlim wrote:Hello, I need help with these questions. Really appreciate your assistance!

1. Mrs Koh bought some toys. She spent 1/4 of the money on a doll and the rest on 4 identical toy cars of the same price. She paid $4.50 more for a doll than on a toy car. How much did she spend on each toy car.

u-> cost of each car
Doll -> u+4.50
Cost of 4 cars -> 4u
Cost of 4 cars -> 3(u+4.50) (remaining 3/4 of money)
So 4u -> 3u + 13.50
u -> 13.50
Hence cost of each car is $13.50

sushi88
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Re: Q&A - PSLE Math

Post by sushi88 » Sat Apr 30, 2016 11:26 am

wilburlim wrote:Hello, I need help with these questions. Really appreciate your assistance!


2. Alan and Berny have 336 cards altogether. 1/4 of Alan's cards is 12 more than 1/5 of Berny's cards. How many cards does Berny have?
u-> 1 part of Alan's card
1 part of Berny's card -> u-12

5(u-12) + 4u ->336
5u - 60 +4u ->336
9u -> 396
u -> 44

So Berny has 5(44-12)= 160 cards.


wilburlim
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Re: Q&A - PSLE Math

Post by wilburlim » Sat Apr 30, 2016 8:49 pm

Eric had an equal amount of goldfish, angelfish and swordfish in his shop. He sold 37 goldfish, some angelfish and swordfish. He had twice as many angelfish as swordfish left. The total number of fishes left was 116. How many swordfish are sold?

Pls help! :thankyou:

Future Academy
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Re: Q&A - PSLE Math

Post by Future Academy » Sun May 01, 2016 12:28 am

wilburlim wrote:Eric had an equal amount of goldfish, angelfish and swordfish in his shop. He sold 37 goldfish, some angelfish and swordfish. He had twice as many angelfish as swordfish left. The total number of fishes left was 116. How many swordfish are sold?

Pls help! :thankyou:
Hi,

Is it a MCQ question or structure question? Is there any other additional information given in the question?

If no, then there is no definite answer, as we can find 18 possible answers. Pls see the working below.


Image

Please let us know if you need further help in Math. Our team of top school teachers from IP/GEP/RGS/NYGH/ACJC and etc will try to support you.

:rahrah: :rahrah:

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Sun May 01, 2016 9:01 pm

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.

PiggyLalala
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Re: Q&A - PSLE Math

Post by PiggyLalala » Sun May 01, 2016 9:13 pm

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

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Sun May 01, 2016 9:20 pm

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.

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