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What is the common denomiator of this problem: 3z divided by 8 minus 7divided by10=6 ??? Help me!!?

by Guest57982  |  earlier

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What is the common denomiator of this problem: 3z divided by 8 minus 7divided by10=6 ??? Help me!!?

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  1. 3z/8 - 7/10 = 6

    Common denominator = 40

    40[3z/8 - 7/10] = 6 * 40

    15z - 28 = 240

    15z = 268

    z = 17.87


  2. 40 is a common denomintor (8*5, and 10*4, 1*40)

    3z/8 - 7/10 = 6/1 == 15z/40 - 28/40 = 240



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