P can do a piece of work in 10 days. Q can do it in 16 days. With the help of R, they finish the work in 4 days. In how many days can R alone do the whole work?

All desks may be tables. Some stools are not chairs. Some tables may not be chairs.

Statements : Some trains are buses.

  Some buses are trucks.

No truck is a car.

Conclusions:I. Some trains are not trucks.

Statement:

I) No water is air

II) Some air are land

III) All land are floor

IV) Some fire are water

Statements:Some combs are boxes.

All boxes are mirrors.

Conclusions:I. Some boxes are combs. 

II. Some mirrors are combs.

Statement:

Some letters are papers

All papers are objects.

Some objects are subjects.

Conclusion:

Statements:

Only a few Hen are Duck

All Bat are Rat

No Duck is a Bat

Some Rat are Cat

Conclusions:

Statements: All diaries are papers.

Some papers are pens.

No pencil is a paper.

Conclusions:I. No diary is a pencil.

Statements: Some cubs are puppies.

No puppy is a calf.

All kittens are puppies.

Conclusions: I. At least some cubs are calves.

Statement:

Some lights are shadows.

All shadows are wall.

Conclusion:  

I. Some lights are not wall.