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
PLEASE HELP!
B. 11
42/22 = 21/x
is
42 x = 22 * 21 = 11 * 2 * 21
21 x = 11 * 21
x = 11