Subtract 27/7 from 90/25, Solve 3 15/25

Subtract 27/7 from 90/25

1^st number: 3 15/25, 2^nd number: 3 6/7

90/25 - 27/7 is -9/35.

Find the least common denominator or LCM of the two denominators:
LCM of 25 and 7 is 175

Next, find the equivalent fraction of both fractional numbers with denominator 175
For the 1st fraction, since 25 × 7 = 175,
90/25 = 90 × 7/25 × 7 = 630/175
Likewise, for the 2nd fraction, since 7 × 25 = 175,
27/7 = 27 × 25/7 × 25 = 675/175
Subtract the two like fractions:
630/175 - 675/175 = 630 - 675/175 = -45/175
After reducing the fraction, the answer is -9/35

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