In a school under ‘shramdan’ camp, 12 students clean for 7 hours. If equal part needs to be cleaned in 6 hours, then how many students will be required?

In an NSS college camp, there is food provision for 350 students for 40 days. If 50 more students join the camp, then for how many days will the provision last?

Two pipes A and B can fill a tank in 28 hours and 21 hours, respectively. If both the pipes are opened simultaneously, then the time taken (in hours) to fill the tank is:

If 1215 kg of rice is consumed by 189 girls for 8 days in a girl’ s hostel, then how much rice (in kg) is required for consumption by 252 girls for 10 days?

X alone can complete a work in 56 days and Y alone can do it in 72 days. both completed in:

25 persons, each working 10 hours a day, can complete 2 units of work in 4 days. How many days will it take for 10 persons working 9 hours a day to complete 18 units of work?

Two pipes, P and Q, together can fill a tank in 5 hours. If pipe P alone can fill the tank in 10 hours, then how much time (in hours) will pipe Q alone take to fill the tank?

8 men and 3 women can do a piece of work in 7 days, whereas 5 men and 1 woman can do it in 12 days. How many men should assist 8 women so that the same work is completed in $$4\frac{1}{5}$$​ days?