Problema Solution
If martha the light house blinks every 5 seconds and billy the light house blinks every 8 seconds how many times will they blink at the same time in the next 6 minutes
Answer provided by our tutors
Least Common Multiple of 5 and 8 is 40
6 min = 6*60 = 360 seconds
lets assume that martha and billy blink together at the start that is in the 0 second thus
they will blink together in the 40 second and every multiple of 40 that is less than 360 that is
0
1*40 = 40
2*40 = 80
3*40 = 120
4*40 = 160
5*40 = 200
6*40 = 240
7*40 = 280
8*40 = 320
9*40 = 360
in the next 6 minutes they will blink together 10 times.