how old is Tim's mum?

Question

Tim is ten years old

his sister Amy is 4/5 Tim's age.

Tim's mum is 4.25 times as old as Amy

How old is Tim's mum?

Answer 1

T = 10 years old

A = (4/5)T

M = 4.25A

So to find Amy's age just multiply Tim's age by 4/5

A = (4/5)*10 = 8

Then to find the Mum's age just multiply Amy's age by 4.25

M = 4.25(8) = 34

So the Mum is 34 years old