# unknown

posted by
**kia**
.

if i am 3 times as old as my sister and last year i was 4 times as old as her how old am i now and how old is she

well how old is your sister

You are 9 and she is 3 (3x3=9)

Last year you were 8 and she was 2

(2x4=8)

your sister is 3 and you are 9

let x = sister's age

and y = your age.

================

last year sister's age was x-1.

last year your age was y-1.

y = 3x for this year.

y-1 = 4(x-1) for last year.

solve for x and y.

The answers above are correct but this tells you how to do it.