2. 外语
  3. The integers x and y are greater than 1. If(4x)(7y)= 756, what is the value of x + y? x + y =______

The integers x and y are greater than 1. If(4x)(7y)= 756, what is the value of x + y? x + y =______

admin2017-10-16  61
问题 The integers x and y are greater than 1. If(4x)(7y)= 756, what is the value of x + y?
x + y =______
选项
答案12
解析 You can solve the given equation,(4x)(7y)= 756, for the product xy:
(4x)(7y)= 756
28xy=756
xy = 27
By trial and error, you find that 3 and 9 are the only two integers greater than 1 whose product is 27. So x + y = 12, and the correct answer is 12.
This explanation uses the following strategy.
Strategy 10: Trial and Error
转载请注明原文地址:https://kaotiyun.com/show/SrkO777K
本试题收录于： GRE QUANTITATIVE题库GRE分类
0

GRE QUANTITATIVE

GRE

相关试题推荐
随机试题
最新回复(0)