10*6 = 6 tens and 0 units.
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A centimetre.
Let the number be 10x + y, with digits xy. We have (1) x(10x+y) = 96 and (2) x - 1 = y Substitute for y in (1): x(10x+x-1) = 96 Simplify: 11x2 - x = 96 11x2 - x - 96 = 0 Factorising the quadratic... (11x+32)(x-3) = 0 Take x-3 = 0 for an integer solution. Thus x=3 and y=2 The number is 32.
10x + 3 = 15 10x = 15 - 3 10x = 12 x = 1.2
-10x-6 = -12 -10x = -12+6 -10x = -6 x = 3/5
100x=63.63 10x=.63 Subtract you get 99x=63 answer is 63/99