11/20 + x = 9/10
x = 9/10 - 11/20
x = 18/20 - 11/20
x = 7/20
Answer:
Step-by-step explanation:
11/20 +x= 9/10
Subtract 11/20 from each side
11/20-11/20 +x= 9/10-11/20
x = 9/10-11/20
We need a common denominator of 20
x = 9/10 *2/2 - 11/20
x =18/20 -11/20
