Identify the value of x that makes each pair of ratios equivalent.
21 to x and 7 to 10
A. 24
B. 30
C. 40
We can set up a proportion:
21/x = 7/10
To solve for x, we can cross-multiply:
21 * 10 = x * 7
210 = 7x
Dividing both sides by 7 gives:
x = 30
Therefore, the answer is B. 30.