Michelle walks every 4 days around her neighborhood and swims every 10 days at the gym for thirty minutes. She did both types of excerise, walking and swimming, on December 7th. What day in December will she do both on the same day again?

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?