Question

advertisement board displays letters in green coloured lights and pictures in yellow coloured lights the green lights come on every 10 seconds at the yellow lights, level 15 seconds if both the lights are turned on at the same time after how many seconds will the come together.

Answer 1

Answer:

30

Step-by-step explanation:

green lights come on every = 10sec

yellow lights come on every = 15sec

the both lights are turned on at the same time after =?

l.c.m = 10,15 =30

the both lights are turned on at the same time after =30

Answer 2

lcm of 10,15

-30

so, they will come together at 30 seconds