Drew exercises every eight days and sara every 12 days. drew and sara both exercised today. how many days will it be until they exercise together again.?

It will take 24 days for them to exercise together. You have to find a common number that both 8 and 12 go into evenly so 8x1=8, 8x2=16, 8x3=24 and 12x1=12, 12x2=24. So this will be Drew's third time at the gym and Sara's second time when they both go together