GMAT数学(博智教材)第62页: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?
X=40+42+44......60=550
Y=(60-40)/2+1=11, 答案应该是561,为什么书后面的答案显示是560?
老师,对于这题ABC的their还有DE的they.他们指代有没有问题呢,就近的话我可以理解成指代records吗The loan company announced it would soon lend money to borrowers with proven records of their not paying back their loans on time,collectively known as subprime lending market.
A.of their not paying back their loans on time
B.of not paying back their loans on time, a group
C.of not paying back their loans on time,with such a group
D.that they do not pay back their loans on time.
E.that they do not pay back their loans on time,such a group