Q&A - P4 Math

[dazzlego]

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]YEAH! the smallest class size is not 45. It is 15!
Work using model and u can find out that the number of pupils who like:
GOLF --> 6 units
TENNIS --> 7 units
SOCCER --> 2 units
TOTAL --> 15 units
Whatever is the question, solve it with this

CHeers :celebrate:

[BigDevil]

Ah! So the possible answers are not multiples of both 5 AND 9, but multiples of 15.

[SarChar]

BigDevil:

Ah! So the possible answers are not multiples of both 5 AND 9, but multiples of 15.

so difficult... :xedfingers: hope not my DD1's exam questions.

[dazzlego]

BigDevil:

Ah! So the possible answers are not multiples of both 5 AND 9, but multiples of 15.

Yup it is multiple of 15

SarChar:

so difficult... :xedfingers: hope not my DD1's exam questions.

And it is not difficult. Coz DD is used to draw model isn't she?
Sometimes they all are better than us when it comes to model questions, I dunno why

[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.