There are 7 red lights and for every 1 red light there are 9 blue lights. How many lights in all?

Question

Mathematics

Kole Preston

3 June, 08:55

There are 7 red lights and for every 1 red light there are 9 blue lights. How many lights in all?

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Answers (1)

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Carly Newman · Answer 1

70

Step-by-step explanation:

We can rewrite the phrase for every '1 red light there are 9 blue lights' as there are 9 blue lights for every red, which may make it slightly clearer.

If there are 7 red lights, and 9 blues for every red, then there are 7*9 blue lights, or 63 blue lights. Now we can add the red and blue lights; 63+7=70, so there are 70 lights in all.