Reon Seow's answer to Estee's Primary 5 Maths Whole Numbers Singapore question.

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Reon Seow
Reon Seow's answer
6 answers (Tutor Details)
1st
Let total number of stamps be y
Let total number of pupils be x

(1) y = 7x + 5
(2) 13x = y + 61
y = 13x - 61

(3) 7x + 5 = 13x - 61
7x + 66 = 13x
6x = 66
x = 11

Answer is 11 pupils
Estee
Estee
4 years ago
Can’t use algebra for P5
J
J
4 years ago
Excess shortage question.

Compared to giving 7 stamps to each student, giving 13 stamps is 6 more than that.

13 - 7 = 6


Now if you want to give each student 6 more stamps on top of the 7 they already are given, your remaining 5 stamps is not enough to do so. You need 61 more stamps to do that.

61 + 5 = 66

So you need to give 66 stamps more to the children.


Since each child gets 6 more stamps,

66 ÷ 6 = 11

There are 11 children.
Estee
Estee
4 years ago
Thanks!