Ravi belongs to a health club. he works out on the rowing machine every 4 days and on weight machines every 6 days. if he worked out on both the rowing machine and the weight machines today, how many days will it be until he does both workouts on the same day again? plz this is urgent

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?