Q&A - PSLE Math

[Ender]

Hi pls help. This question is from eph preparing for psle maths.

A pie chart shows how a sum of money was shared among four men. (Sorry have problem posting the pie chart).
Max 25% of pie chart
John 30% of pie chart
Bobby unknown %
Ivan unknown %

Ivan's share was 70% more than Bobby's share. If the sum of money was $21600, how much money did Ivan get?

Thanks

Max and John total portion is 55%.
Therefore Ivan and Bobby total portion is 45% . (100% - 55%)

Total amount of Ivan and Bobby =45% of $21600 = $9720

Ivan is 70% more than Bobby, that can mean if Bobby is 10u, Ivan will be 10u + 7u = 17u

10u + 17u = $9720
27u = $9720
u = 360

Ivan gets = 17u = 17(360) = $6120##

[Steadyberry]

thanks very much ender & alfretztay.

[lynn01sg]

Hi, pls help on the following:
Mandy and Rani went shopping with a total sum of $219. Mandy spent twice as much as Rani. Mandy had half as much money left as Rani. The amount of money that Rani had left was $8 more than what she had spent. How much money did Rani have at first?

[sushi88]

Hi, pls help on the following:
Mandy and Rani went shopping with a total sum of $219. Mandy spent twice as much as Rani. Mandy had half as much money left as Rani. The amount of money that Rani had left was $8 more than what she had spent. How much money did Rani have at first?

---<--------spent------ ><--left----->
M (----u-----)(----u-----)(--u/2---)(4) [left =1/2(u+8)]

R (----u-----)(----u-----)(8)
--<-spent--><--left------->

Their total is 219.

4 1/2u + 12 -> 219
9/2u -> 207
u-> 46
Hence Rani has 2u+8 -> 2(46)+8 = $100 at first.

[lynn01sg]

thanks sushi88!

[questionable_i]

Can anyone help me with these questions? Thank you

[Ender]

Can anyone help me with these questions? Thank you

12)
Total pupils in the beginning =>100u
boys = >40u
girls = > 60u

Remaining boys => 0.75 X 40u = 30u
Rwmaining girls => 0.9 X 60u = 54u

Total remaining => 30u + 54u = 84u

Percentage of remaining=> 84u/100u X 100 = 84% ##

13)
(43+∠CDE) + (48 +∠DCE) = 180
∠CDE + ∠DCE = 180 - 43 - 48 = 89

(∠CDE + ∠DCE) + ∠CED = 180
89 + ∠CED = 180
∠CED = 180 - 89 = 1̶0̶1̶ 91##

[Laurel111]

Can someone please help. Catholic Prelim 2015. Thanks!

[Laurel111]

Repost bigger picture. Thanks.

[iwork]

The big square is 19x19, and can be cut into 5 smaller squares of the same size. Each triangle is actually the same size of the inner small square. So the area of the small square is 19x19/5 = 72.2. So the side of the small square is sqrt(72.2)=8.49cm. To the nearest cm, should be 8cm.