George vacuums the rugs every 21 days, mows the grass every 12 days, and pays the bills every 15 days. Today he did all three. How long will it be before he has another day like today?
6 answers
LCM(21,12,15) = 2^2*3*5*7 = 420
Steve you are wrong! its 315
Steve is right...
You are both wrong
its 84 sec
sorry that was for another question
Ann and Bob are cycling on a track. Ann completes one lap every 12 seconds, and Bob completes one lap every 21 seconds. After how many seconds will Ann and Bob reach the finish line at the same time, assuming that they started together?
Ann and Bob are cycling on a track. Ann completes one lap every 12 seconds, and Bob completes one lap every 21 seconds. After how many seconds will Ann and Bob reach the finish line at the same time, assuming that they started together?
1 answer