Jon earned money baby-sitting. He spent 1/4 of the money on a guitar and then he gave 1/4 of what wa

Discussion in 'Calculator Requests' started by math_celebrity, Dec 5, 2022.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    Jon earned money baby-sitting. He spent 1/4 of the money on a guitar and then he gave 1/4 of what was left to charity. If he has $108 left, how much money did he start with?

    Calculate initial spend:
    Charity = 1/4 * 3/4 left = 3/16
    1/4 + 3/16 = 7/16
    This means he has 1 = 7/16 left
    16/16 - 7/16 = 9/16

    Let the starting amount be s:
    If he has 108 left, then we have 9s/16 = 108
    s =$192
     

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