SOLUTION: I am having a hard time trying to solve this problem. I remember doing these in the past, but have just forgotten how to solve it. If you could please help that be great! Thanks!

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Question 479240: I am having a hard time trying to solve this problem. I remember doing these in the past, but have just forgotten how to solve it. If you could please help that be great! Thanks!
A group of runners participated in a 10-kilometer race. One-eighth of the runners completed the race in 40 minutes or less. Seven-twelfths of the runners needed between 40minutes and one hour to finish. The remaining 70 runners took one hour or longer to complete the race. How many runners participated in the race?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A group of runners participated in a 10-kilometer race. One-eighth of the runners completed the race in 40 minutes or less. Seven-twelfths of the runners needed between 40minutes and one hour to finish. The remaining 70 runners took one hour or longer to complete the race. How many runners participated in the race?
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n - n*(1/8 + 7/12) = 70
n - n*(3/24 + 14/24) = 70
n - 17n/24 = 70
7n/24 = 70
7n = 1680
n = 1680/7 = 240 runners