In a class of 26 students, 14 have cats, 10 have dogs and 5 have parrots. If 4 have dogs and cats, 1 has dog and parrot, 3 have parrots and cats and no one has all the three. How many have none?

Mani is double the age of Prabhu , Ramona is half the age of Prabhu . If Mani is sixty years old , find out the age a Ramona . 

Mouni is 2 years elder than Sanjay. If the age of Sanjay 10 years ago was 13 years, then Mouni's present age is

The sum of the ages of Arjun and his daughter is 48. The average of the ages of Arjun, his daughter and his son is 25. What is the age of Arjun’s son?

If 5=10, 6=18, 7=28 then 8=?

which of the following meanings of the arithmetical signs will yield the value ' zero ' for the expression given below?
200x100 + 300 x 200 10÷2 + 40

If “@” denotes “added to”, “#” denotes “multiplied by”, “®” denotes “divided by” and “%” denotes “subtracted from”, then which of the following equation is true?

If ‘+’ stands for division, ÷ stands for multiplication, multiplication stands for addition; then which one of the following equation is correct?