Answer:
60 + 7x = 120
Step-by-step explanation:
Money with Riley at beginning = $60
Money saved by Riley in 1 week = $7
Her brother has $120
let there be x weeks in she saves money to make it equal to what his brother has (i.e $120)
Money saved by Riley in x week = $7*x = $7x
total money with riley after x weeks= Money with Riley at beginning + Money saved by Riley in x week = 60 + 7x
but it is given that she has same amount as his brother
60 + 7x = 120
=> 7x = 120 - 60 = 60
=> x = 60/7 = 8 4/7
4/7 = 4 days as one week has 7 days
Thus, it will take 8 weeks 4 days to have the same amount of money
Required equation is 60 + 7x = 120.
