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The maximum recommended pulse rate R, when exercising, for a person who is x years of age is given by the equation R = 176?0.8x 。 What is the age, in years, of a person whose maximum recommended pulse rate when exercising is 1 40 ?
If x > y and y > z, which of the following represents the
greatest number?
(A) 40
(B) 45
(C) 50
(D) 55
(E) 60
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答案：
B
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