42 and 55 have no common factor ((2 x 3 x 7) and (5 x 11)) so 42/55 is the simplest form.
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To reduce a fraction to its simplest form you need to identify any common divisors of the numerator and denominator. In this case, both the numerator (55) and the denominator (220) can divide by 55. Doing this gives a new fraction of 1/4. There are no more common divisors, and so 1/4 is the fraction's simplest form.
Expressed as a proper fraction in its simplest form, 55 percent is equal to 11/20 or eleven twentieths.
It is already in its simplest form as 55/36
-42/55
It is: 55/8