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Ross and Annie do chores at their home acreage. Ross mows the acreage lawn every 12 days, and Annie bathes the dog every 21 days. If Ross and Annie do their chores today, how many days will pass before they both do their chores again on the same day?

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taskmasters

84 days will pay before they both do their chores again on the same day.


Ross mows the lawn
      Annie bathes the dog 



12 x
1 =
12                          21 x 1 =  21



12 x 2 = 24                          21 x 2 =  42



12 x 3 = 36                          21 x 3 =  63



12 x 4 = 48                          21 x 4 =  84



12 x 5 = 60

21 x 5 = 105



12 x 6 = 72                          21 x 6 = 126



12 x 7 =
84                          21 x 7 = 147



12 x 8 = 96                          21 x 8 = 168



12 x 9  = 108                       21 x 9 = 189



12 x 10 = 120                      21 x 10 = 210

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