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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



Answer :

apologiabiology
so at the end of the year maple:oak=3:11 and there were 132 oak so 132=11 units 132/11=12 so there were 3 times 12 maple trees at the end or 36 so 36:132
assuming the units stay the same (1 unit=12) in the biginning of the year there were 108 maple trees 
108-36= 72
there were 72 more

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