Q&A - P4 Math

[BigDevil]

[Moderator's note]

@ppnadh

Please do not start a new thread every time you have a question.
There is already a Math Q&A thread http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=67&t=25121. Please post your Math questions
in that thread in the future.

Thank you.

PS. this thread will be merged with the Q&A thread soon.

[ppnadh]

1) Tan bought 16 kg of meat. He use 3/8 of it to make meatballs and 1/2kg to make some dumplings. How many kilograms of meat had she left?


2) ___ + ____ + _____ =12/14

what is ____ * 21?

3)A bottle of syrup was 3/4 full. After chan used 100ml of syrup from the bottle, it became 5/12 full. What was the capacity of the bottle?

Pl explain me in detail how to do this questions?

[mathfreak]

ppnadh:

1) Tan bought 16 kg of meat. He use 3/8 of it to make meatballs and 1/2kg to make some dumplings. How many kilograms of meat had she left?


2) ___ + ____ + _____ =12/14

what is ____ * 21?

3)A bottle of syrup was 3/4 full. After chan used 100ml of syrup from the bottle, it became 5/12 full. What was the capacity of the bottle?

Pl explain me in detail how to do this questions?

Solutions:

1) After using 3/8 of the meat to make meatballs, Tan must have 1-3/8=8/8-3/8=5/8 of the meat left. This is equal to 16*5/8=10 kg of meat. After using 1/2kg of the meat left to make dumplings, Tan would have 10-1/2 = 9 1/2 kg of meat left. Hence the answer is 9 1/2 kg.

2) This question is quite ambiguous. I assume that each of the three blanks represent the same fraction. In that case, we divide 12/14 by 3 to get 4/14. The blank represents 4/14, and 21 times of 4/14 is equal to 4/14*21=4/2*3=6. Hence the answer is 6.

3) At first, it was 3/4 full, and after that, it was 5/12 full. Hence, Chan must have used 3/4-5/12=9/12-5/12=4/12=1/3 of the bottle's syrup. Since 1/3 of the bottle's syrup is 100 ml (given by question), the capacity of the bottle is 100*3=300 ml. Hence the answer is 300 ml.

Hope this helps.

[ppnadh]

Am sorry about it. I am quite new to the forum and i never knew things…

[ppnadh]

Thanks a lot…your answers are correct…gr8 work.

[Jamesbond]

1) Ali and Bala had $126 altogether. Ali had more money than bala. Each of them spent 1/3 of their money. Then bala had $28 left. How much money did ali have left?


Pl explain me this sum in detail. Thanks in advance.

[elisammom]

Hi pls help


The ratio of Christine’s age to Wendy’s age is 5 : 6.

In 5 years’ time, their total age will be 76. What is Wendy’s age now?

Thanks

[jedamum]

P4 has ratio ?!

[MathIzzzFun]

elisammom:

Hi pls help


The ratio of Christine's age to Wendy's age is 5 : 6.

In 5 years' time, their total age will be 76. What is Wendy's age now?

Thanks

Hi

Christine's age --> 5u
Wendy's age --> 6u

5 years' time :
Christine's age --> 5u + 5
Wendy's age --> 6u + 5
11u + 10 --> 76, 1u --> 6
6 x 6 = 36. Wendy's is 36 years old now.

cheers.

[2DMommy]

Bala left $28 = 2/3 money

Bala spent 1/3 = $14
Total amount Bala has = 3 x $14 = $42

Ali has $126 - $42 = $84 at first
He spent 1/3 = $84 / 3 = $28
Ali left $84 - $28 = $56