What is the equation to the word problem? Currently, you have $60 & your sister has $135. You decide to save $5 of your allowance each week,while your sister decides to spend her whole allowance plus $10 each week. How long will it be before you have as much as your sister?
U=60+5w
S=135-15w
set U=s
60+5w=135-15w
add 15w to each side, subtract 60
20w=75
divide by 20
weeks=4 weeks