AC Lim's answer to Silin's Primary 6 Maths Data Analysis Singapore question.

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AC Lim
Ac Lim's answer
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1st
15 cupcake: 9.60 x 3=28.80
15 dotnut : 5.20 x 5 = 26.00
15 item different = 28.80-26.00= $2.80
Therefore $8.40/$2.80= 3 x of 15 items
So, total of students = 3 x 15 = 45.
Hope this helps