Question

Solve the proportion.
7
b
21
18
b = [?]

Answer 1

b = 6

Explanation:

To find the answer, find the GCF of 7 and 21, which is 7, and divide it by 7/7 to get 1/3, now the equation is 1/3 = b/18. How many times does 3 multiply to get 18? 6, multiply the first side of the equation by 6/6 to get 6/18, now we have 6/18 = b/18, since they are the same, b = 6

Answer 2

b = 6

Explanation:

here's your solution

=> 7/21 = b/18

=> by cross multiplication

=> 21b = 7*18

=> b = 126/21

=> b = 6

hope it helps