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The reciprocal of 1/2 is 2/1 = 2
you do that if you need to divide fractions, its called using the recipical.
The product of a number and its reciprocal is one. A reciprocal is, quite simply, the opposite of the number.
Let L equal the larger of the two integers and S the smaller. Then L=2S. Also L-1/S=1/S. Starting with this second equation and solving for L results in L=2/S. Equating the two values of L produces 2/S=2S and 1/S=S. The solutions to this last equation are S=1 or S=-1. If L is to be the larger of the two integers, then S must equal 1 and L must equal 2.