Question

if a red light flashes every 5 seconds and a green light flashes every 7 seconds how many times would they both flash at the same time in three minutes

Answer 1

Answer:

5 times

Step-by-step explanation:

Just take the lcm of both 7 and 5 which is 35.

Now in 3 minutes there are total 180 sec. and in that only five 35 can come not after that.

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