Q&A - P4 Math

[doraemo]

Thank you, dazzlego!!

[MathIzzzFun]

BigDevil:

MathIzzzFun:

[quote=\"Gold\"]Hi,


Please help with the question below:-
In a class, 2/5 of the pupils liked golf and 7/9 of the remaining pupils liked tennis. The rest of the pupils liked soccer, how many pupils were there in the class altogether?

Thanks.

Smallest class size is 45 - class size must be a multiple of 5 & 9

cheers.

Can provide workings?
The answer must be multiples of 5 & 9? I thought 60 is also a possible answer?[/quote]oops... my mistake... read as 7/9 of the pupils instead of \"remaining pupils\".. in this case, smallest class size is 15 or class size is multiple of 15...now must really get old flower glass..

cheers

[Gold]

Thanks for responding and yes, the answer is 45. Let me retype the question as I’ve missed out some points.


In a class, 2/5 of the pupils liked golf and 7/9 of the remaining pupils liked tennis. The rest of the pupils liked soccer. If there were 12 more pupils who liked golf than soccer, how many pupils were there in the class altogether?

Please help to explain as I don’t understand. This is from P4 SA2 ACS Maths Booklet B (2010). Thanks

[MathIzzzFun]

Gold:

Thanks for responding and yes, the answer is 45. Let me retype the question as I've missed out some points.


In a class, 2/5 of the pupils liked golf and 7/9 of the remaining pupils liked tennis. The rest of the pupils liked soccer. If there were 12 more pupils who liked golf than soccer, how many pupils were there in the class altogether?

Please help to explain as I don't understand. This is from P4 SA2 ACS Maths Booklet B (2010). Thanks

Golf --> 2/5 class
remaining pupils --> 3/5 class
Tennis --> 7/9 x 3/5 = 21/45 class
soccer --> 1-2/5-21/45 = 6/45 class
2/5 class - 6/45 class = 12
12/45 class = 12
class --> 45 pupils

cheers.

[verykiasumummy]

Gold:

Thanks for responding and yes, the answer is 45. Let me retype the question as I've missed out some points.


In a class, 2/5 of the pupils liked golf and 7/9 of the remaining pupils liked tennis. The rest of the pupils liked soccer. If there were 12 more pupils who liked golf than soccer, how many pupils were there in the class altogether?

Please help to explain as I don't understand. This is from P4 SA2 ACS Maths Booklet B (2010). Thanks

offering my help :

2/5 like golf so remaining 3/5.
3/5 is later divided into 9 parts. 7 out of the 9 parts like tennis.
the rest 2 parts like soccer.
since 3/5 = 9 parts,
then 2/5 = 6 parts. (u have to reflect this in your model.)

therefore :
6 parts like golf
7 parts like tennis
2 parts like soccer

6 - 2 = 4 (golf - soccer)
4u --> 12
1u --> 3
15u --> 45

hope it helps.

[Gold]

Thank you, MathIzzzFun and verykiasumummy.

[verykiasumummy]

Gold:

Thank you, MathIzzzFun and verykiasumummy.

sorry i was slow in replying, i didnt see MathIzzzFun's reply while i quoted ur post... i must have taken so long to type... haha....

welcomed, gold...

[vsk]

Can someone help with this ?


Ming Xun had an equal number of blue and green marbles. After giving away 36 blue marbles and buying another 84 green marbles. he found that he had 4 times as many green marbles as blue marbles. How many blue marbles did Ming Xun have at first ?

Thank you.

[Maths Hub]

vsk:

Can someone help with this ?


Ming Xun had an equal number of blue and green marbles. After giving away 36 blue marbles and buying another 84 green marbles. he found that he had 4 times as many green marbles as blue marbles. How many blue marbles did Ming Xun have at first ?

Thank you.

5 units --> 84 + 36 = 120
1 unit --> 120 ÷ 3 = 40 (Blue at last)
40 + 36 = 76 (Blue in the end)

[Xiao Hu]

vsk:

Can someone help with this ?


Ming Xun had an equal number of blue and green marbles. After giving away 36 blue marbles and buying another 84 green marbles. he found that he had 4 times as many green marbles as blue marbles. How many blue marbles did Ming Xun have at first ?

Thank you.

Please see
http://i47.tinypic.com/mt56iu.jpg\">
4u-1u=84+36
3u =120
1u=40

So at first, Blue marbles= 1u+36=76.