Answer:

A.2/3

Step-by-step explanation:

Find the least common denominator or LCM of the two denominators:

LCM of 21 and 7 is 21

Next, find the equivalent fraction of both fractional numbers with denominator 21

For the 1st fraction, since 21 × 1 = 21,

5

21

=  

5 × 1

21 × 1

=  

5

21

Likewise, for the 2nd fraction, since 7 × 3 = 21,

3

7

=  

3 × 3

7 × 3

=  

9

21

Add the two like fractions:

5

21

+  

9

21

=  

5 + 9

21

=  

14

21

14/21 simplified gives  

2

3

So, 5/21 + 3/7 = 2/3

Answer:

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Step-by-step explanation:

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