Subtract 9/14 from 72/20, Solve 3 12/20

Subtract 9/14 from 72/20

1^st number: 3 12/20, 2^nd number: 9/14

72/20 - 9/14 is 207/70.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 14 is 140

Next, find the equivalent fraction of both fractional numbers with denominator 140
For the 1st fraction, since 20 × 7 = 140,
72/20 = 72 × 7/20 × 7 = 504/140
Likewise, for the 2nd fraction, since 14 × 10 = 140,
9/14 = 9 × 10/14 × 10 = 90/140
Subtract the two like fractions:
504/140 - 90/140 = 504 - 90/140 = 414/140
After reducing the fraction, the answer is 207/70
In mixed form: 267/70

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