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6 July, 07:29

Bob's gas tank is 1/2 full. After he buys 3 gallons of gas, it is 2/3 full. How many gallons can Bob's tank hold?

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  1. 6 July, 08:33
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    (2/3) * x - (1/2) * x = 3

    *make common denominators

    (2*2) / (2*3) * x - (3*1) / (3*2) * x = 3

    (4/6) * x - (3/6) * x = 3

    (1/6) * x = 3

    x = 3 * (6/1)

    x = 3*6

    x = 18 gallons of gas
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