50 men can build a tank in 40days, but though they begin the work together, 5 men quit every ten days. The time needed to build the tank is ?5
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Q: 50 men can build a tank in 40days, but though they begin the work together, 5 men quit every ten days. The time needed to build the tank is ?
- 150 daystrue
- 248 daysfalse
- 347.5 daysfalse
- 449 daysfalse
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