A computer game has builders and destroyers. They are 32. Some of them try to build a wall around a palace while the rest try to demolish it. Each builder can build a wall alone in 36 hours while any destroyer can demolish it in 30 hours. If all 32 are activated when there is no wall and the wall is built in 2.5 hours, how many of them are destroyers?

A computer game has builders and destroyers. They are 32. Some of them

1.	A computer game has builders and destroyers. They are 32. Some of them try to build a wall around a palace while the rest try to demolish it. Each builder can build a wall alone in 36 hours while any destroyer can demolish it in 30 hours. If all 32 are activated when there is no wall and the wall is built in 2.5 hours, how many of them are destroyers?
A.	12
B.	6
C.	8
D.	10
Answer» D. 10

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