I could give you an answer for each number, but I suspect the answer required is 7 as it is the only Prime number, the rest are composite numbers.
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15: (15, 1) (5, 3) 12: (12, 1) (6, 2) (4, 3)
Equivalent fractions to 6/15 = 12/30, 18/45, 24/60 Multiply 6/15 by 2/2, 3/3, 4/4,... 6 /15 * 2/2 = 12/30 6 /15 * 3/3 = 18/45 6 /15 * 4/4 = 24/60
252.
Factors for 12 are: 1, 2, 3, 4, 6, 12 Factors for 15 are: 1, 3, 5, 15 Factors for 24 are: 1, 2, 3, 4, 6, 8, 12, 24
5 6 7 10 4 15 12