Q&A - P5 Math

[RyanGow]

Hi its my first time in Kiasu Parents.


Need help on a P5 Math question:

1. Classes 5A and 5B have the same number of pupils. The ratio of the number of boys in 5A to the number of boys in 5B is 2:3. The ratio of the number of girls in 5A to the number of girls in 5B is 7:4.

a) Find the ratio of the number of boys to the number of girls in 5A.
b) If there are 15 fewer girls than boys in 5B, how many pupils are there in 5B?

Thanks much! :xedfingers:

[smartmummy]

Sharmum:

Hi,


Need help on the following 2 questions:-

http://i43.tinypic.com/2z9gqp4.jpg\">

Let dc=u
so bc=2u
6u=108
u=18
area of bec=1/2*bc*dc
=1/2*2u*u
=18*18
=324cm2

[smartmummy]

Sharmum:

Question 2:


http://i39.tinypic.com/15qvq6s.jpg\">

:thankyou:

area of PSQ=1/2*25*12=150cm2
area of PQRS=2*150=300cm2
PS=300/15=20cm

[Sharmum]

smartmummy:

Sharmum:

Question 2:


http://i39.tinypic.com/15qvq6s.jpg\">

:thankyou:

area of PSQ=1/2*25*12=150cm2
area of PQRS=2*150=300cm2
PS=300/15=20cm

Hi Smartmummy,

Thank you for your help !!

:salute:

[smartmummy]

RyanGow:

Hi its my first time in Kiasu Parents.


Need help on a P5 Math question:

1. Classes 5A and 5B have the same number of pupils. The ratio of the number of boys in 5A to the number of boys in 5B is 2:3. The ratio of the number of girls in 5A to the number of girls in 5B is 7:4.

a) Find the ratio of the number of boys to the number of girls in 5A.
b) If there are 15 fewer girls than boys in 5B, how many pupils are there in 5B?

Thanks much! :xedfingers:

5A:5B
Pupils n:n
Boys 2:3
4:6
6:9 make the number of pupils same

Girls 7:4
Pupils 7+6=13:4+9=13
9u-4u=15
5u=15
1u=3
13*3=39 pupils in 5B

[RyanGow]

Thank you GrandMaster! :xedfingers:

I am very impressed with this website.

[marstolive]

Hi, this is how you solve the question...

5/5-1/5=4/5(left after sold books on Sun)
4 units->40
1 unit-> 40 / 4=10
5 unit-> 10 x 5= 50
50+ 560=610
He had 610 books at first.

Regards :rahrah:

[smartmummy]

Pls help the following qns - no urgent.Thanks


Q1) Olivia bought 15 3/5kg of sweets and 29 1/4 kg of chocolates.She mixed them up and packed them equally into 31 packets, each with a mass of 1.41kg.Each packet was sold at $7.20 and the remaining sweets and chocolates were sold at $9 per kg.How much did she collect from all the sweets and chocolate sold?

Q2)The ratio of the number of girls to the number of boys taking part in a swimming assessment was 6:5.The assessment showed that the ratio of the number of girls’ swimmers to the number of girls’ non-swimmers was 5:2.The ratio of the number of boys’ swimmers to the number of boys’ non-swimmers was 3:2.
a)What fraction of the children were non-swimmers?
b)If there were 30 more boys’ non-swimmers than girls’ non-swimmers how many swimmers were there altogether?

Q3)During a fund raising project, class 5A raised 2/3 as much money as the total amount raised by classes 5B&5C.Class 5B raised 1/5 as much money as the total amount raised by class 5A and 5C.
a)What fraction of the funds was raised by class 5A?
b)Class 5B raised $104 less than class 5C.How much money did class 5C raise?

Q4) There were 20 more pears than plums at a fruit stall.After 1/5 of the pears and 3/10 of the plums were sold, there were 46 pears and plums left.How many plums were left over.

TIA.

[PapayaDad]

Q1) Olivia bought 15 3/5kg of sweets and 29 1/4 kg of chocolates.She mixed them up and packed them equally into 31 packets, each with a mass of 1.41kg.Each packet was sold at $7.20 and the remaining sweets and chocolates were sold at $9 per kg.How much did she collect from all the sweets and chocolate sold?


Total weight
15 + 29 +3/5 + 1/4
44 + 3/5 + 1/4
3/5 = 600gram
1/4 = 250gram
Total = 44kg 850 gram
31 x 1.41 = 43.71
Balance = 44.85 - 43.71 = 1.14kg

Money collect from 31 packet = 31 x 7.20 = $223.20
Money collected from balance = 1.14 x9 = 10.26
Total money = 223.20 + 10.26 = $233.46

[smartmummy]

Thankyou papayadad.