According to the topic, the water intake of the water inlet pipe per hour 1/5.
Then 1/5 (2+4) -2x= 1.
6/5-2x= 1
2x= 1/5
x= 1/0
Then1÷110 =10 (hours)
Answer: It takes 10 hour to drain a pool of water just by opening the outlet pipe.
second
Solution: Suppose the purchase price of a jacket is X yuan, then there is
x( 1+50%)×0.8= 168
x= 140
168- 140=28 (yuan)
According to the boss, he actually earned 28 yuan, not 8 yuan, so he was dishonest.