If Frank’s age is double of Willis’ age and the sum of their ages is 42. What are their ages?

[math_celebrity]

If Frank’s age is double of Willis’ age and the sum of their ages is 42. What are their ages?

Let Frank's age be f. Let Willis's age be w. We're given two equations:

1. f = 2w <-- Double means multiply by 2
2. f + w = 42

Substitute equation (1) into equation (2):
2w + w = 42

To solve for w, type this equation into our search engine. We get:
w = 14

Now, take w = 14, and substitute it back into equation (1) to solve for f:
f = 2(14)
f = 28