If the product of the integers w，x，y and z is 770，and if 1＜w＜x＜y＜z．what is the value of w+z?

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问题 If the product of the integers w，x，y and z is 770，and if 1＜w＜x＜y＜z．what is the value of w+z?

选项 A、10
B、13
C、16
D、18
E、21

答案B

解析 The prime factorization of 770 is 2×5×7×11, so w= 2, z= 11, and w+z= 13.
The correct answer is B.

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