Yee Miao Ling's answer to Ruby Ng's Primary 5 Maths question.

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Yee Miao Ling
Yee Miao Ling's answer
29 answers (Tutor Details)
The above method works but algebra is only taught in P6 syllabus and even then it's basic algebra. So not sure if your school teacher will accept the algebra method for P5 homework. Here's an alternative without using algebra, but it's definitely longer with more working. :)

This question can be done with the help of drawing a model (it's optional). The important thing to remember is the word "of". When used with fraction or percentage or decimal, it is a hint that you need to multiply.

For example, 1/3 of 120 pupils, is 1/3 X 120
50% of $10 is 50% X $10, etc.