sara's answer to Maddie's Primary 6 Maths Ratio Singapore question.

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sara
Sara's answer
3 answers (A Helpful Person)
1st
Basically both number must be numbers that can be divided by 5 .
And they should only have exactly 4 common factors


Second number must be able to be divided by 4 since the second number will be 4times as much as the first number.

I tried working with 15 and 60 and it works too.