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13 December, 03:58

Tim counted a total of 40 white cars and yellow cars. there were 9 times as many white cars as yellow cars. how many white cars did tim count?

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  1. 13 December, 07:27
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    you have 2 equations to work with

    1st eq. w + y = 40

    2nd eq. w=9y

    multiply everything in 1st equation by 9 to get

    9w + 9y = 360

    rearrange 2nd equation to w-9y=0

    now add 9w + 9y = 360 to w-9y = 0

    to get 10w=360

    dive both sides by 10 to get w=36 white cars
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