Find the value of b: 14:42 = 3b:63?

To find the value of b, we can set up a proportion:

14/42 = 3b/63

Now, we can cross multiply:

14 * 63 = 42 * 3b
882 = 126b

Now, divide both sides by 126 to solve for b:

882/126 = b
b = 7

Therefore, the value of b is 7.

Step 1: Cross-multiply

14 x 63 = 42 x 3b

882 = 126b

Step 2: Solve for b

Divide both sides by 126:

882 / 126 = b

b = 7