Riley has $60 and her brother has $120.Riley saves $7 per week. Write an equation that represents the number of weeks, x,it will take them to have the same amount of money?

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.

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