Jar A and Jar B contain a total of 480 marbles. The ratio of the number of marbles in Jar A to the number of marbles in Jar B is 5:3 5 : 3\,5:3
Some marbles are moved from Jar A to Jar B. The ratio of the number of marbles in Jar A to the number of marbles in Jar B is now 7:5 7 : 5\,7:5
Work out how many marbles were moved from Jar A to Jar B. You must show all your working.
