NIACL Model Paper 4 with solutions for free online practice

From the first two statements it is obvious that the capacity of 1 man = the capacity of 2.5 women.And the total work can be finished by 320 women in one day.
Now; 12 men +10 women = 12 x 2.5 + 10 = 40 women Hence, during 6 days the work done is equal to the work of 240 women in one day. Hence, the remaining work will be finished in (320 - 240) 10 = 8 days.