How do you explain and draw for 10x4

In a school 2/3 of the students study a language of those who study a language 2/5 study french

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?

Having a hard time understanding this question (see attachment).