84 days will pay before they both do their chores again on the same day. <span>
<span>
</span><span><span>
Ross mows the lawn
<span> Annie bathes the dog </span>
</span>
<span>
12 x
1 =
12 21 x 1 = 21
</span>
<span>
12 x 2 = 24 21 x 2 = 42
</span>
<span>
12 x 3 = 36 21 x 3 = 63
</span>
<span>
12 x 4 = 48 21 x 4 = 84
</span>
<span>
12 x 5 = 60
21 x 5 = 105
</span>
<span>
12 x 6 = 72 21 x 6 = 126
</span>
<span>
12 x 7 =
84 21 x 7 = 147
</span>
<span>
12 x 8 = 96 21 x 8 = 168
</span>
<span>
12 x 9 = 108 21 x 9 = 189
</span>
<span>
12 x 10 = 120 21 x 10 = 210
</span></span></span>