Q&A - P4 Math

[blessed777]

ppnadh:

1) 3/8+3/8+3/8+3/8 = ____ * 3/8+3/8.


Pl explain me how to do this.....

2) There were 245 comic books on sale at a book fair. James sold 3/5 of the books and packed the remaining books into sets of 6. How many sets of comic books did he manage to pack?

The answer is 98. But pl explain in detail how to derive it.

Thanks in advance.

1. There are 4 of 3/8 so. 3 x 3/8 + 3/8

2. The remaining books : 2/5 x 245= 98
pack into sets of 6 : 98 : 6 = 16 sets with 2 remaing book

Hth

[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.