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Anonymous
21 * 60 = 1,260
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The LCM of 60 and 21 is 420
40% off = 60% 60% of 21 dollars = 21*60/100 = 12.60 dollars
60 - x = 3(34 - x) = 102 - 3x so 2x - 42, x = 21 so she was 60 - 21 ie 39 (and son was 13).