x=y+5

x*y=(x+y)*6

Solution: x= 15, y= 10.

If the construction time of team A is 2x, the construction time of team B is X, and the total project cost is Y, use

y = 2x * 100+x *( 100+50)= 350 x & lt； 1500 x & lt； 30/7

1/ 15 * 2x+ 1/ 10 * x & gt； = 1x & gt； =30/7

The result is contradictory, that is, the topic is wrong. Complete the subject requirements on the premise that it can no longer be guaranteed to be completed.