Q&A - PSLE Math

[tamunawara]

hi


can you please send me the link to the site. I am unable to find it. Thanks a lot again

[kiasustar]

Hi anyone can help with this Qn?


A farmer has some chickens and ducks. If he sells 2 chickens and 3 ducks every day, there will be 50 chickens left when all the ducks have been sold. If he sells 3 chcikens and 2 ducks every day, there will be 25 chickens left when all the ducks have been sold.
a) how many ducks are there?
b) how many chickens are there ?


:udawoman: :udaman: :thankyou:

[isetan]

tianzhu:

isetan:

Hi ,
Just attempt this question.....is the ans:-
For (a) 29.7
(b) 1.57

Hi

We have the same answers.

Best wishes

Thanks Tianzhu!

[MathIzzzFun]

kiasustar:

Hi anyone can help with this Qn?


A farmer has some chickens and ducks. If he sells 2 chickens and 3 ducks every day, there will be 50 chickens left when all the ducks have been sold. If he sells 3 chcikens and 2 ducks every day, there will be 25 chickens left when all the ducks have been sold.
a) how many ducks are there?
b) how many chickens are there ?


:udawoman: :udaman: :thankyou:

Hi

similar questions were discussed in previous posts.

here are 4 approaches to solve such questions -

http://i45.tinypic.com/1yjxhz.png\">

http://i46.tinypic.com/ejvktd.png\">

using the ratio approach,

case 1, ducks sold : chickens sold --> 3 : 2 --> 6u : 4u, 50 chickens left
case 2, ducks sold : chickens sold --> 2 : 3 --> 6u : 9u, 25 chickens left
Total number of chickens remain the same,
4u + 50 = 9u + 25
5u --> 25, 1u --> 5

Number of chickens --> 4 x 5 + 50 = 70
Number of ducks --> 6 x 5 = 30

cheers.

[kiasustar]

Thank you very much for the detailed explanations with answer.

[kiasuaunt]

Hi - nd help with this:


1. There were 610 pupils in a school. After 3/5 of the girls and 145 boys left the school, the new ratio of the number of boys to the girls became 11:8.
a.Find the number of boys in the school at first.
b.Find the total number of pupils in the school in the end.

2.Geraldine and Amy went shopping for groceries together. They had $162.50 with them. Amy spent 2.5 times as much money as Geraldine. The amount of money Geraldine had left was $16 more than what she had spent. She had 4 times as much money left as Amy.

a.How much money did Geraldine spent?

b.How much money did Amy have at first?

Thank you.

[ksoh3000]

Hi


Can anyone assist me to solve this problem?

-Ben and Steven have some sweets. If Ben eats 4 sweets and Steven eats 3 sweets each day, Ben will have 156 sweets left when Steven finishes all his sweets. If Ben eats 1 sweet and Steven eats 4 sweets each day, Ben will have 338 sweets left when Steven finishes all his sweets. How many sweets does Ben have ?


- Liow and Thomas were 535km apart. At 0830,Liow started to drive towards Thomas at a constant speed. Half an hour later ,Thomas drove towards Liow at a constant speed of 15km/h slower than Liow’s.They were 125km apart at 1200.
(a) Find Liow’s speed
(b) How much more time would they take to pass each other?

[ksoh3000]

Hi


Can anyone assist me to solve this problem?

-Ben and Steven have some sweets. If Ben eats 4 sweets and Steven eats 3 sweets each day, Ben will have 156 sweets left when Steven finishes all his sweets. If Ben eats 1 sweet and Steven eats 4 sweets each day, Ben will have 338 sweets left when Steven finishes all his sweets. How many sweets does Ben have ?


- Liow and Thomas were 535km apart. At 0830,Liow started to drive towards Thomas at a constant speed. Half an hour later ,Thomas drove towards Liow at a constant speed of 15km/h slower than Liow’s.They were 125km apart at 1200.
(a) Find Liow’s speed
(b) How much more time would they take to pass each other?

[MathIzzzFun]

kiasuaunt:

Hi - nd help with this:


1. There were 610 pupils in a school. After 3/5 of the girls and 145 boys left the school, the new ratio of the number of boys to the girls became 11:8.
a.Find the number of boys in the school at first.
b.Find the total number of pupils in the school in the end.


Thank you.

Hi

Q1.
In the end,
Boys : Girls --> 11u : 8u (2/5 of girls)

At first,
Boys : Girls --> 11u + 145 : 20u
Total Boys + Girls ==> 31u + 145 = 610
1u --> 15

At first, total number of boys --> 11 x 15 + 145 = 310
In the end, total number of boys + girls --> 19 x 15 = 285

cheers.

[MathIzzzFun]

kiasuaunt:

Hi - nd help with this:


2.Geraldine and Amy went shopping for groceries together. They had $162.50 with them. Amy spent 2.5 times as much money as Geraldine. The amount of money Geraldine had left was $16 more than what she had spent. She had 4 times as much money left as Amy.

a.How much money did Geraldine spent?

b.How much money did Amy have at first?

Thank you.

Hi
Geraldine's spending : Amy's spending : --> 4u : 10u
Amount left, Geraldine : Amy --> 4u + 16 : 1u + 4 (**geraline's amount left = 4 x amy's amount left)

Total amount of money both had
19u + 20 = $162.50
1u --> $7.5

Geraldine's spending --> 4 x $ 7.5 = $30
At first, Amy had --> spending + amount left = 11 x $7.5 + 4 = $86.50

cheers.