A tank can be filled up by two pipes A and B in 2 hours and 3 hours
respectively. A third pipe C can empty the full tank in 6 hours. If all the taps can be turned on at the same time, the tank will be full in

• 1 hour

• 40 minutes

• 1.5 hours

• 3 hours

Age of father 10 years ago was three times the age of his son. After 10 years, father’s age is twice that of his son. The ratio of their present ages is:

• 7:3

• 9:5

• 7:4

• 11:7

Average age of ten persons learning yoga is 32
years. When the age of their instructor is added,
the average age becomes 34 years. The age of
their instructor is ?

• 54

• 52

• 46

• 56

Of the three numbers, the first is one third of the second and twice the third. The average of these numbers is 27. The largest of these numbers is

• 18

• 36

• 54

• 108

Sameer is as much younger to Mohan as he is older to Arun. If the sum of the ages of Mohan and Arun is 48, the age of Sameer is

• 20 years

• 24 years

• 30 years

• cannot be determined