Question

I almost cry please help. Q:Two signs are on a street. One blinks every 10 s and the other every 6 s. How many times per minute do they blink together? (The answer is twice and why please show how you find out the answer is twice)

Answer 1

Explanation:

if one blinks every 10 seconds it means that it blinks 6 times in one minute

60/10=6

the other one blinks every 6 seconds

60/6=10 blinks ten times

first one blinks: 10,20,30,40,50,60

second one blinks:6,12,18,24,30,36,42,48,54,60

is like finding GCM

common number are 30 and 60

hence- twice

Answer 2

10, 20, 30, 40, 50, 60, 70, 80, 90, 100

6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 80,

So twice

Explanation:

What else do you need but that ^