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primary 6 | Maths | Percentage
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Xeno
Xeno

primary 6 chevron_right Maths chevron_right Percentage chevron_right Singapore

I am unable to comprehend the question. I need step by step explanation. Thank.

Btw, the answer is 40 pupils in the class.

Date Posted: 3 years ago
Views: 315

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Tan Yick Loong
Tan Yick Loong's answer
30 answers (A Helpful Person)
1st
Is this really a primary 6 question? Can use algebra to solve it?
AC Lim
AC Lim
3 years ago
Question was not very clear. It never specify not pupils select 1 type of food only.
Tan Yick Loong
Tan Yick Loong
3 years ago
@ AC Lim's, Agree, I had to read the question repeatedly to get it right.

To Xeno, sorry if I did not explain it clearly in my workings. The 4 who liked all types of food are counted in all groups, E.g

For 60% who liked Jap and Korean, it includes the 4 who liked everything. So to get only the percentage of pupils who liked only Jap and Korean, we would have to take:

60% - 2x, where 2x is 4 expressed in percentage terms.

Likewise for the other two groups. We then add all three groups together, add in the 4 ppl (2x) and the 2 ppl (X) to make up 100% of the students.
AC Lim
AC Lim
3 years ago
Me too. .. ... Think for about a day on this question.

From your working, it can straight away use 4 and 2 instead of 2x and x.
60%-4 + 30%-4 + 25%-4 +4 +2=100%
115%-4-4+2=100%
15% →6
100% = 100% ÷ 15% × 6 = 40.

But you really produced a good method/working here.