Shelley compared the number of oak trees to the number of maple trees. she counted 9 maple trees to every 5 oak trees in the beginning of the year. at the end of the year, the new ratio of the number of maple tree to the number of oak trees is 3: 11. at the end of the year, there were 132 oak trees . how many more maple tree were then in the beginning of the year than the end of the year? explain