Q&A - P5 Math

[leng2005]

Please help me.

[belnanna]

Can someone help on this question please..
Thanks in advance

Ryan and Sam shared a sum of money in the ratio of 2:3. When Ryan gave Sam $20, he had half of what Sam had. How much did Sam have at first?

[homeworkgurusg]

Can someone help on this question please..
Thanks in advance

Ryan and Sam shared a sum of money in the ratio of 2:3. When Ryan gave Sam $20, he had half of what Sam had. How much did Sam have at first?

Before R : S = 2:3 (total 5units )
After R : S = 1:2 (total 3units)
There is no change of total. So use LCM 15 to get total equal for before and after.

Before (x3) R:S = 2x3 : 3x3 = 6:9
After (x5) R:S= 1x5 : 2x5 = 5:10

Ryan descreased 1unit.
1u --> $20
Sam at first is 3units --> $60

Hope it helps.

Cheers
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[belnanna]

I need help on this too.. Thanks in advance.

There were 3/5 as many children as adults on a bus. At the next stop, 3 children boarded and 2 adults alighted from the bus.Then, there were 5/6 as many children as adults on the bus. How many children were there on the bus at first.

[homeworkgurusg]

Please help me.

In 1 min -> 2ℓ + 3ℓ = 5ℓ

In 10 min -> 5ℓ x 10 = 50ℓ

Height of container -> 50 000 cm3 / 24cm x 40cm= 50cm

Cheers
<<Mod's Note - URL removed - pls comply with our forum's ad posting rules. Thank you>>

[leng2005]

Thank you homeworkgurusg and speedmaths.com!

[speedmaths.com]

Can someone help on this question please..
Thanks in advance

Ryan and Sam shared a sum of money in the ratio of 2:3. When Ryan gave Sam $20, he had half of what Sam had. How much did Sam have at first?

Before R : S = 2:3 (total 5units )
After R : S = 1:2 (total 3units)
There is no change of total. So use LCM 15 to get total equal for before and after.

Before (x3) R:S = 2x3 : 3x3 = 6:9
After (x5) R:S= 1x5 : 2x5 = 5:10

Ryan descreased 1unit.
1u --> $20
Sam at first is 3units --> $60

Hope it helps.

Cheers
http://homeworkgurusg.blogspot.com

thanks very much !

Hi,

It should be:

1u --> $20
Sam at first is 9 units --> $180

Cheers


speedmaths
.

[Jasmine82]

Hi can anyone help me with this question?I know it is a easy one but the answer I got is different from the answesheet.

Q:A bottle contained 3/4L of oil.Mrs.Lim used 1/6 ofthe oil to fry a fish.How much oil was left in the bottle?(Leave your answer as afraction in its simplest form)
My Ans: 3/4-1/6=14/24
=7/12
Answer Key-------5/8

[bb_ mom]

Hi can anyone help me with this question?I know it is a easy one but the answer I got is different from the answesheet.

Q:A bottle contained 3/4L of oil.Mrs.Lim used 1/6 ofthe oil to fry a fish.How much oil was left in the bottle?(Leave your answer as afraction in its simplest form)
My Ans: 3/4-1/6=14/24
=7/12
Answer Key-------5/8

Fraction of oil left ->5/6
Amount of oil left -> 5/6*3/4=5/8 litres

[Jasmine82]

Hi can anyone help me with this question?I know it is a easy one but the answer I got is different from the answesheet.

Q:A bottle contained 3/4L of oil.Mrs.Lim used 1/6 ofthe oil to fry a fish.How much oil was left in the bottle?(Leave your answer as afraction in its simplest form)
My Ans: 3/4-1/6=14/24
=7/12
Answer Key-------5/8

Fraction of oil left ->5/6
Amount of oil left -> 5/6*3/4=5/8 litres

Thank You for the fast reply.I understood now.