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Clay and Timmy had $318 altogether. Timmy had $18 less than Clay. After Timmy spent some money at the store, Clay had 6 times as much money as Timmy. How much money had Timmy spent at the store?

 May 27, 2022
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Let x = Clay's money

Let y = Timmy's money

            x + y = 318 (1)

            y = x - 18 (2)

Substitute (2) to (1):

        x + x - 18 = 318

           2x/2 = 336/2

           x = 168

From (2): y = x - 18

                y = 168 - 18

                y = 156

Let z = amount of money Timmy spent at the store

(150 - z) = 168

900 - 6z = 168

732/6 = 6z/6

z = $122

 May 27, 2022
edited by Slimesewer  May 27, 2022

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