30, 60, 90, 120, 150.
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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, 36, 42, 48, 54, 60, 66
30, 60, 90, 120, 150
6, 12, 18, 24, 30
6+12+18+24+30=90