im pretty sure it already is in lowest terms
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70% of 55 over 42=70/100 * 55 / 42 =.7 *55 /42(.7 * 55) / 42 = 0.916666667
42 and 55 have no common factor ((2 x 3 x 7) and (5 x 11)) so 42/55 is the simplest form.
36/55 is in its simplest form.
55/12 is already in its simplest form
It is already in its simplest form as 55/36