PREP 数学－52

zhangpeiyu01

52. If 500 is the multiple of 100 that is closest to X and 400 is the multiple of 100 that is closest to Y , which multiple of 100 is closest to X +Y

(1) X 小于500

(2) Y 小于 400

这题什么意思阿?

谢谢大家

gifile

If 500 is the multiple of 100 that is closest to X and 400 is the multiple of

100 that is closest to Y
从这句话，我们知道   550<x<450  ,    450<y<350， 1000<x+y<800
单独(1) X 小于500     550<x<500     1000<x+y<850   无法判断which multiple of

100 is closest to X +Y
同理，单独(2)也不行

1）2） 550<x<500  ， 450<y<400   1000<x+y<900  所以  还是无法判断

选E