How do I answer this maths problem?

Question

Gill saves £105 each week for x weeks. Matt saves £147 each week for y weeks. If Gill and Matt end up saving the same total amount of money, write down the smallest possible values for x and y.

Answer 1

105=3*5*7

147=3*7*7

LCM=3*5*7*7=735

735/105=7 weeks for x

735/147=5 weeks for y