Question

3/7 + t = 20/21

A. t = 9/21
B. t = 11/21
C. t = 10/21

Answer 1

3/7+t=20/21
t= 20/21 - 3/7
t= 20/21 - 9/21 *we bring to a common denominator*
t= 11/21
Hope this helps <33

Answer 2

B should be the right answer