First three common multiples of 5 and 6 are 30, 60 and 90.
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Well 5x6 has only one answer: 30
But respectably the first five multiples of five are 5,10,15,20 and 25
And the first five of six are
6,12,18,24 and thirty
The first three multiples of 6 are 6, 12 and 18. For them to be common, they need to be compared to another set of multiples.
The first six multiples of 9 are 9, 18, 27, 36, 45, 54. The first six multiples of 12 are 12, 24, 36, 48, 60, 72.
They are 12 and 24
The first four multiples of five: 5, 10, 15, 20
16, 32, 48. Since 16 is divisible by 4. Every multiple of 16 is also a multiple of 4, so I just took the first 3 multiples of 16.
ANSWER: 12