J's answer to Quan Yi's Primary 5 Maths Rate & Ratio Singapore question.
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Grouping difference question:
Every minute,
printer B prints 25 - 20 = 5 more photos than printer A.
In 2 minutes, printer B prints 5 × 2 = 10 more photos than printer A.
In 3 minutes, 5 × 3 = 15 more photos than printer A.
How many minutes are needed such that printer B prints 45 more photos than printer A?
45 ÷ 5 = 9
9 minutes are needed.
Every minute,
printer B prints 25 - 20 = 5 more photos than printer A.
In 2 minutes, printer B prints 5 × 2 = 10 more photos than printer A.
In 3 minutes, 5 × 3 = 15 more photos than printer A.
How many minutes are needed such that printer B prints 45 more photos than printer A?
45 ÷ 5 = 9
9 minutes are needed.
Date Posted:
3 years ago
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