Question

A girl walks 3/4 of the way home in 18 minutes. At the same rate, she can walk the rest of the way home in
A. 4 1/2 minutes
B. 6 minutes
C. 9 minutes
D. 24 minutes

Answer 1

let x = time it takes to walk home.
(3/4)*x = 18
Solve for x.

Answer 2

and then subtract the 18 minutes already walked.

Or, consider that there is 1/4 of the way to go. That is 1/3 as far as he's already gone, so it will take 1/3 as long to walk it. That is, 6 more minutes.

Answer 3

A girl walks 3/4 of the way home in 18 minutes. At the same rate, she can walk the rest of the way home in
A. 4 1/2 minutes
B. 6 minutes
C. 9 minutes
D. 24 minutes

Answer 4

The answer is A. Do 3/4*18 = 54/4