SOLUTION: Traffic lights are green for 3/4 of the time and orange for 1/10 of the time. What fraction of the time are the lights red?

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Question 1080139: Traffic lights are green for 3/4 of the time and orange for 1/10 of the time. What fraction of the time are the lights red?
Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
1+-+3%2F4+-+1%2F10 = 6%2F40 = 3%2F20 = 0.25 - 0.1 = 0.15.

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

Traffic lights are green for 3/4 of the time and orange for 1/10 of the time. What fraction of the time are the lights red?
Green: 3%2F4

Orange: 1%2F10

Red: