6, 12, 18, 24, 30
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30, 60, 90, 120, 150
The common multiples of 5 and 6 are the multiples of their lowest common multiple (which is 30), so there are infinitely many common multiples of 5 and 6. The first five are: 30, 60, 90, 120, 150.
6+12+18+24+30=90
Five multiples of 42 are 1, 2, 6, 7, 21, 42.
There are five multiples of six that fall between 70 and 100: 72, 78, 84, 90, 96.