Ishaan is 72 years old and William is 4 years old. How many years will it take until Ishaan is only

Discussion in 'Calculator Requests' started by math_celebrity, Mar 27, 2020.

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  1. math_celebrity

    math_celebrity Administrator Staff Member

    Ishaan is 72 years old and William is 4 years old. How many years will it take until Ishaan is only 5 times as old as William?

    Express Ishaan and William's age since today where y is the number of years since today, we have:
    i = 72+y
    w = 4+y

    We want the time for Ishaan age will be 5 times William's age:
    i = 5w
    72 + y = 5(4 + y)

    We plug this equation into our search engine and get:
    y = 13
     

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