A farmer has an apple orchard consisting of Fuji and Gala apple trees. Due to high winds this year 10% of his trees cross pollinated. The number of his trees that are pure Fuji plus the cross-pollinated ones totals 187, while 3/4 of all his trees are pure Fuji. How many of his trees are pure Gala?
22
33
55
77
88
We can plug in the answers, which represent the number of pure Gala trees.
Since 10% of all the trees cross pollinated, the total number of trees must be a multiple of 10.
Thus, when the correct answer choice (the number of pure gala trees) is added to 187 (the number of pure Fuji trees plus the number of cross-polinated trees), the sum must be a multiple of 10.
Only
B works: 33+187 = 220.
The correct answer is
B.
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