X can work as fast as Y and Z together. X and Y together can finish the same task 3 times as fast as Z. If all three working together can finish the task in 18 days, how many days, will Z take to finish the task?
Let the number of days it takes. X to finish the task be x Y to finish the task be y Z to finish the task be z Therefore, as per the given relations 
By adding the first two equations, we get 
Two statements are given followed by two conclusions, numbered I and II. Assuming that the information given in the statements is true, even if it seems...
In each of the following question below are given some statements followed by some conclusions. Taking the given statements to be true even if they see...
Statements:
Only a few spiders are insects.
All insects are ant.
Some ant are pesticides.
Only a few pesticides are...
Statements:
All Rose are Lily.
No Lily is Lotus.
Some Lotus are Daisy.
Some Daisy are not Sunflower.
Conclusions: ...
Statements:
All phones are mobiles.
Some sims are phones.
No card is a sim.
Conclusions:
I. Some mobiles are ...
Statements:
Some woods are tables.
All tables are teaks.
No teak is a chair.
Conclusions:
I. Some woods ...
Statements:
100% King are Queen
Some Army are Queen
No Queen are Soldier
Conclusions:
I. Some Soldier are Army
II. At least Some King are Army
Statement:
Only GMs are PMs
Only a few CMs are president
No president is PM
Conclusion:
I. Some GMs are presidents
Statement:
No cup is a medal.
All medals are trophies.
No trophy is a shield.
Conclusion:
I. Some medals are not ...
Some laptops may be buses. Some buses are not mouse. Some pendrives may be buses.
