Question

Mary is 12 years old now, and is three times older than her sister. how old will mary be when she is twice as old as her sister?

Answer 1

Mary's current age:12

Her sister's age:4

Mary's age will be 8

Because Mary is 12 years old, and is three times older than her sister.

So 12 divided by 3 is equal to 4

And 4×2=8