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SAT数学Problem Solving练习题五.

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  • 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

    • 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.

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

  • Question #3: In the figure below, angle AMB is 100o, angle BMD is 40o and angle CME is 60o. What is the value of angle CMD? Figure not drawn to scale

    (a) 20o (b) 30o (c) 40o (d) 50o (e) 80o

    • Answer: If angle AMB is 100o, then angle BME is 180o - 100o = 80o BMC + CMD = 40o BMC + CMD + DME = 80o If we subtract the 2 equations, DME = 40o CMD + DME = 60o BMC + CMD + DME = 80o If we subtract the 2 equations, BMC = 20o CMD = BME - BMC - DME = 80o - 40o - 20o = 20o
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