Answers

Add 20/84 and 28/80

20/84 + 28/80 is 247/420.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   20/84 = 20 × 20/84 × 20 = 400/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   28/80 = 28 × 21/80 × 21 = 588/1680
4. Add the two like fractions:
   400/1680 + 588/1680 = 400 + 588/1680 = 988/1680
5. 988/1680 simplified gives 247/420
6. So, 20/84 + 28/80 = 247/420

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