7/12 + 11/30 is 19/20
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If the denominator (the lower part of the fraction) is the same you just add the numerators (the upper part) and place the result over the common denominator.
0.6364
The reciprocal of a fraction is the same fraction flip-flopped. So the numerator becomes the denominator, and the denominator becomes the denominator. So for seven over thirty one, the reciprocal is thirty one over seven
0.23333
2.7%