GWd4/6-29 bu hui

LISAYUAN750616

GWD-4/6-29

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?

(1)   One of the machines produces copies at the constant rate of 250 copies per minute.

(2)   One of the machines produces copies at twice the constant rate of the other machine.

why not D instead of E

The annual rent collected by a corporation from a certain building was x percent more in 1998 than in 1997 and y percent less in 1999 than in 1998.  Was the annual rent collected by the corporation from the building more in 1999 than in 1997?

(1)   x > y

(2)   xy/100 < x – y

bu hui

XIE XIE

LISAYUAN750616

ni zhen shi tai hao le.

i have little problem with the 1999 a(1+x%-y%) i asumme it is a(1+x%)(1-y%)

sorry to draw you so much attention.

LISAYUAN750616

xie xie le-all