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20 13 national senior high school entrance examination mathematics examination questions
Assuming that the completion time of Party A and Party B is X and Y respectively, then

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.