If x is equal to the sum of the even integers from 40 to 60, inclusive, and y is the number of even integers from 40 to 60, inclusive, what is the value of x + y ?
550
551
560
561
572
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y=11
40到60中间有几个数!!!!!!!!
我也是。。
我也是..
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Y =40到60的全部偶数的数量
X= 40+42+44+46+48+...60 =550
Y = 11