List of top General Aptitude Questions on Data Interpretation asked in GATE XH-C1

Pipes P and Q can fill a storage tank in full with water in 10 and 6 minutes, respectively. Pipe R draws the water out from the storage tank at a rate of 34 litres per minute. P, Q and R operate at a constant rate.
If it takes one hour to completely empty a full storage tank with all the pipes operating simultaneously, what is the capacity of the storage tank (in litres)?

A particular school management wants to contact all parents, all businessmen and all engineers. The following statistics are available with the school.
Businessmen = 50
Engineers = 25
Parents = 2500
Businessmen who are engineers = 0
Businessmen who are parents = 25
Engineers who are parents = 15
The number of people who need to be contacted are _________.