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math

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Salma's penny bank is 1/2 full. After she adds 360 pennies, it is 4/5 full. How many pennies can Salma's bank hold?

  • math - ,

    1/2 = 5/10
    4/5 = 8/10

    8/10 - 5/10 = 3/10

    3/10x = 360

    x = 360 / (3/10)

    x = 360 * 10/3

    x = 1200

  • math - ,

    ( 1 / 2 ) x + 360 = ( 4 / 5 ) x

    360 = ( 4 / 5 ) x - ( 1 / 2 ) x

    360 = ( 8 / 10 ) x - ( 5 / 10 ) x

    360 = ( 3 / 10 ) x

    ( 3 / 10 ) x = 360 Multiply both sides by 10

    3 x = 360 * 10

    3 x = 3600 Divide both sides by 3

    x = 3600 / 3

    x = 1200 pennies

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