2:7::12:x
Divide the '12' by '2' and multiply by '7'
Hence
12 x 7 / 2
6 x 7 = 42
Hence
2:7::12:42
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12 - 7 + 2 = 7
7/12 + 1/6 = 7/12 +(1×2)/(6×2) = 7/12 + 2/12 = (7+2)/12 = 9/12
-12
12 + 7 - 2 12 + 7 = 19 19 - 2 = 17 or 7 - 2 = 5 5 + 12 = 17
12/7 or 1 and 5/7