prep

meckychen · 发表于 2010-2-1 12:51:40

When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year?

(A) 3/10

(B) 2/5

(C) 1/2

(D) 2/3

(E) 6/5

How to calculate?

thank you.

ryanxie · 发表于 2010-2-1 13:59:56

4+6x=(1+1/5)(4+4x) => x=2/3

meckychen · 发表于 2010-2-1 14:06:21

thanks

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