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18 June, 07:34

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?

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  1. 18 June, 08:03
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    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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