## Q&A - P5 Math

- Special-one
- KiasuNewbie
**Posts:**7**Joined:**Sat Apr 30,

### Re: Q&A - P5 Math

Hi. Need help for this question.

George has 9 cards more than 3 times that of Henry's. Izra has 20 more cards than 2/3 that of George while George has 13 cards more than Izra.

(a) How many cards does Izra have

(b) How many cards do the 3 boys have altogether?

George has 9 cards more than 3 times that of Henry's. Izra has 20 more cards than 2/3 that of George while George has 13 cards more than Izra.

(a) How many cards does Izra have

(b) How many cards do the 3 boys have altogether?

### Re: Q&A - P5 Math

If Alan gives 120 paper cranes to Ben,both of them will have the same number of cranesFlweewa wrote:Hi,

Help needed for this question, how to solve by P5 method.

Alan and Ben folded some paper cranes.If Alan gives 120 paper

cranes to Ben,both of them will have the same number of cranes.If Ben gives 18 paper cranes to Alan, Alan will have 7 times as many paper cranes as Ben.how many paper cranes does Alan have?

Referring to the above statement in red. It would be helpful in the future for other questions you recognize immediately it means Alan has 240 more cranes then Ben.

If Ben gives 18 paper cranes to Alan, Alan will have 7 times as many paper cranes as Ben.

This second statement, imagines if ben reduce by 18, and Alan gain by 18. The gap between the is now 240 +18 + 18 = 276

Modelling it would look like below,

uuuuuuu <- 7u

u <-1u

Gap is 6u. Gap is also 276

6u = 276

u = 276/6 = 46

ben actually has u + 18 = 46+18 = 64

Alan has 240 more = 64 + 240 = 304 ####

### Re: Q&A - P5 Math

Let George be 3uSpecial-one wrote:Hi. Need help for this question.

George has 9 cards more than 3 times that of Henry's. Izra has 20 more cards than 2/3 that of George while George has 13 cards more than Izra.

(a) How many cards does Izra have

(b) How many cards do the 3 boys have altogether?

Izra would have= 2u + 20

George has 13 more than Izra

3u - (2u +20) = 13

3u - 2u - 20 = 13

u = 33

George = 3u = 99

A) Izra = 99 - 13 = 86 #

3 times of Henry + 9 = George

3 times of Henry = 99 - 9 = 90

Henry = 90/3 = 30

B) Altogether they have = 99 +86 +30 = 215 cards ###

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

### Re: Q&A - P5 Math

I would solve the above problem as follows :Ender wrote:Since it's a percentage, we let the total cakes in the beginning be 100u. That means 30u for chocolate and 70u for Pandan.chloecube wrote:Hi, need help fir these 2 sum

A baker baked some cakes.30% of the cakes were chocolate cakes and the rest were pandan cakes. After selling 88 pandan cakes and 5/6 of the chocolate cakes, he has 1/5 of the original number of cakes left.

A)what fraction of the pandan cakes were sold?

B) how many chocolate cakes did he sell?

There's two way to refer to the left over.

1st way is 1/5 of the original number.

Leftover = 1/5 X100u = 20u

2nd way to reference to leftover is after he sold 88 pandan and 5/6 chocolate

Leftover = (70u - 88) + 1/6(30u)

= (70u - 88) + 5u

= 75u -88

The leftover are equal,

20u = 75u - 88

55u = 88

u = 1.6

Total cakes in the beginning = 100u = 160 cakes

A) Fraction of pandan cakes sold = 88/160 = 11/20 ##

B) He sold 5/6 of 30u of choc. which is 25u

Choc cakes sold = 25u = 40 ###

(a)

Total ——- 100u

chocolate : 30u (before)

(5/6) x 30u = 25u

30u – 25u = 5u (after)

100u – 30u = 70u

pandan : 70u (before)

70u – 88 (after)

5u + 70u – 88 = 75u – 88

(75u – 88) x 5 = 375u – 440 ——- 100u

1u ——- 440/(275) = 1.6

70u ——- 1.6 x 70 = 112

88/112 = 11/14

(b)

25u ——- 25 x 1.6 = 40

Ans : (a) 11/14; (b) 40 chocolates cakes.

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

### Re: Q&A - P5 Math

You are most welcome; chloecube.chloecube wrote:school teacher just got back that a) answer is 11/14

thks alfretztay

- kiasuparents_2010
- YellowBelt
**Posts:**26**Joined:**Fri Aug 13,

### Re: Q&A - P5 Math

Hi, My girl is P5 student at MBS in the best class. Her math backslid since SA1, from 95 marks in P4 to 75 marks in SA1 P5 (highest score in class is 99) and scored very bad during few class tests (5/20 etc.). Already had Mind Strecher tuition since P3, I realized she is quite confused on what methods to be used for prob sloving questions. Appreciate your guidence on how to improve her math in short period of time? Also Any other tuition centre can recommend?

### Re: Q&A - P5 Math

My apologies for reading the question wrongly. I had reference to the wrong total when it was suppose to be for total of pandan only.chloecube wrote:school teacher just got back that a) answer is 11/14

thks alfretztay

### Re: Q&A - P5 Math

Hi ender

no apologies pls, u've been a great help and thks!

I was also careless on my part

no apologies pls, u've been a great help and thks!

I was also careless on my part