Mr. Toney gets his car washed every 15 days. Mr. Brown gets his car washed every 20 days. Today, they are both getting their cars washed. IN how many days will they both be getting their car washed?


  1. They will both be getting their car washed in 60 days.

    Toney: 15, 30, 45, 60
    Brown: 20, 40, 60
    Count the amount of days (or multiply) until the days for both match up

  2. They both get their cars washed on every 60th day.

    You can solve this equation by finding the lcm (least common multiple):

    15 30 45 60 75 90 105

    20 40 60 80 100

    The lowest common multiple is 60 as it is the first multiple the two have in common.

    So, in sixty days, they’ll both get their car washed again


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