Problema Solution
A year ago Alex was 4 times as old as his sister Cara. This year he is only 3 times as old as Cara. How old were Alex and Cara last year? How old are they this year?
Answer provided by our tutors
let age of alex = x
cara = y
1 year ago:
(x-1) = 4(y-1)
==>x = 4y - 3
now:
x = 3y
==>3y = 4y-3
y=3
x=9
age of alex = 9
age of cara = 3