Kristen and Julia went skating. Julia skated 30 minutes longer than Kristen. If Julia skated for 55

Discussion in 'Calculator Requests' started by math_celebrity, Oct 28, 2016.

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  1. math_celebrity

    math_celebrity Administrator Staff Member

    Kristen and Julia went skating. Julia skated 30 minutes longer than Kristen. If Julia skated for 55 minutes, write and solve an equation to find how long Kristen skated

    Let j be the number of minutes Julia skates and k be the number of minutes Kristen skated. We have 2 equations:
    (1) j = k + 30
    (2) j = 55

    Plug (2) into (1)
    j = 55 + 30
    j = 85 minutes, or 1 hour and 25 minutes
     
    math_celebrity, Oct 28, 2016
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