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Mathematics for IGCSE & O level - Ratio And Proportion (Section 1 - No. 23)

The ratio of John's age to Mary's age is 2:3. If John is 10 years old, how old is Mary?
10
15
20
25

توضيح

John:Mary=2:3, 10=2*5 so Mary is 3*5 =15

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