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Primary 4 | Maths
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Sylvia soh
Sylvia Soh

Primary 4 chevron_right Maths

I need help with dis

Date Posted: 7 years ago
Views: 521

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Shiekh Mohamad Farhan
Shiekh Mohamad Farhan's answer
224 answers (Tutor Details)
1st
Just list out the multiples of 5 until 50 and the multiples of 7 lesser than 50.
5, 10, 15, 20, 25, 30, 35, 40, 45
7, 14, 21, 28, 35, 42, 49
From this we see that Andrew is 20 years old, since its a multiple of 5, and when he's 21, its a multiple of 7.