Q&A - P4 Math

[pineapple tarts]

hello, can someone help with this pls

Ali has 3 times as many stickers as Mohan. If Ali gives 165 stickers to Mohan, he will have ½ as many stickers as Mohan. How many stickers do they have altogether?

Many thanks in advance.

[PiggyLalala]

One possible approach: Using units and parts:
A: M = 3u : 1u = 9u: 3u
A: M = 1p : 2p = 4p: 8p
Total remains the same:
Therefore 12u = 12p, that is u = p
Therefore (before) A:M = 9u:3u
(after) A: M = 4u:8u
Therefore 5u = 165
u= 33
Total = 12u = 396 stickers

[usaik]

Another possible approach would be using model as below :

[Jenlimtz]

Hi

Need help:

1) Farmer Lim sold 1/2 as many eggs on Saturday than on Friday. He sold 78 less eggs on Sunday than on Friday. If he sold a total of 172 eggs on the three days, how many eggs did he sell on Sunday?

2) Tin A contains some 20-cents coins and Tin B contains some 50-cents coins. There are 9 more coins in Tin A than in Tin B. The amount of money in Tin A is $2.70 less than that in Tin B.
How many 50-cents coins are there in Tin B?

TIA

[pineapple tarts]

many thanks to piggylalala and usaik. I need some time to digest the solution. I am seeing stars . . .

[pineapple tarts]

I cannot figure out why 165 is 5 units. let me think let me think . . .

[tianzhu]

1) Farmer Lim sold 1/2 as many eggs on Saturday than on Friday. He sold 78 less eggs on Sunday than on Friday. If he sold a total of 172 eggs on the three days, how many eggs did he sell on Sunday?

2) Tin A contains some 20-cents coins and Tin B contains some 50-cents coins. There are 9 more coins in Tin A than in Tin B. The amount of money in Tin A is $2.70 less than that in Tin B.
How many 50-cents coins are there in Tin B?

Hi

Q1) You may use MD.

Fri ------ 2 units
Sat ----- 1 unit
Sun ------ 2 units – 78

2 units + 1unit + (2units – 78) ------172

5 units ------ 250
1 unit ------50

Number of eggs sold on Sun ----- (2*50) – 78 ------22.



Q2) Suppose or pretend that you remove 9 20 cents coins from Tin A.

9*20 ---- 180

Now Tin A has (270+180) or 450 cents less than Tin B

Difference in value between a 50 cents coin and 20 cents coin ------ 30 cents.

450/30 ------ 15

There are 15 50 cents coins in Tin B.

Best wishes

[bookwormkids]

Q1) May bought 3 apples and 4 oranges. Sally bought 4 apples and 3 oranges. Sally paid $0.20 more than May. May paid $3.40 for the fruit. Find the cost of 2 apples.

Q2) The figure shown below is made up of 4 equal rectangles. Its perimeter is 28 cm. Calculate its area.



Thanks for your help.

[MathIzzzFun]

Q1) May bought 3 apples and 4 oranges. Sally bought 4 apples and 3 oranges. Sally paid $0.20 more than May. May paid $3.40 for the fruit. Find the cost of 2 apples.

Q2) The figure shown below is made up of 4 equal rectangles. Its perimeter is 28 cm. Calculate its area.



Thanks for your help.

Hi

May paid $3.40, Sally paid $3.60

Total paid by May & Sally = $7.00 = 7 apples + 7 oranges
So, 1 apple + 1 orange = $1

Sally paid $3.60 for 4 apples + 3 oranges, so 1 apple = $3.60 - $3.00 = $0.60, 2 apples = $ 1.20

Q2. length = 3 x breadth... with this, I think you can solve it

cheers.

[thmejlfm]

Hi! Need Help!

Question: Gopal, Jack, Timothy have 60 Stamps altogether.
Timothy has 20 stamps more than Jack. Timothy has twice as many stamps as Gopal.

(a) How many stamps does Gopal have?
(b) How many stamps should Jack give to Timothy so that Timothy would have thrice as many stamps as Jack?