Identify the value of x that makes each pair of ratios equivalent.

start fraction 42 over 22 end fraction and start fraction 21 over x end fraction
A. 12
B. 11
C. 10

2 answers

B. 11
It might help the student if the bot would show some steps, just
blurting out the answer does not help at all.

42/22 = 21/x
42x = 22*21
x = 22*21/42
= 22*1/2
= 11