SAT数学备考经典模拟题训练26

>>SAT数学模拟题：SAT数学备考经典模拟题训练26

>>SAT考试辅导

· Question #1: If a, b and c are consecutive integers, a < b < c, and a + b + c = 96, what is the value of b?

(a) 30

(b) 31

(c) 32

(d) 33

(e) 34

· Question #2: The price of wheat was $5/bushel on January 2007 and $9/bushel on January 2008. By what percentage did the price change?(a) 10%

(b) 40%

(c) 60%

(d) 80%

(e) 90%

解析

o Solution: If a, b and c are consecutive numbers, b = a + 1 and c = a + 2.

Then, a + (a + 1) + (a + 2) = 96, so 3·a + 3 = 96.

a = (96 - 3)/3 = 31.

b = a + 1 = 32.

o Answer: The price change is [(Price2008 - Price2007)/Price2007]·100 = [(9 - 5)/5]·100 = (4/5)·100 = 80%

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