Verified Answer :

dragonfaws

5/7 + 1/4 = 20/28 + 7/28 = 27/28

Billymkhoi

Let's look at the two denominators:
7= 7
4= 4
LCM(7,4)= 47= 28

5/7+ 1/4
= (54)/ (74)+ (17)/ (4*7)
= 20/28+ 7/28 (common denominator is 28)
= 27/28

The final answer is 27/28~

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