Answers

Subtract 20/72 from 90/20

1^st number: 4 10/20, 2^nd number: 20/72

90/20 - 20/72 is 38/9.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 20 × 18 = 360,
   90/20 = 90 × 18/20 × 18 = 1620/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   20/72 = 20 × 5/72 × 5 = 100/360
4. Subtract the two like fractions:
   1620/360 - 100/360 = 1620 - 100/360 = 1520/360
5. After reducing the fraction, the answer is 38/9
6. In mixed form: 42/9

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