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?

To prepare a sweet, you need 5 cups of milk and 3 cups of sugar. If you are given 25 cups of milk, how much sugar will you need to prepare the sweet and exhaust all the milk? 

In an office of 50 people, 18 write with their right hand, 26 write with their left hand and 2 can write with both hands. How many cannot write? 

Select the correct set of symbols:
34  16  4  12  = 26

If P means -, Q means +, R means x and  S means ÷ then what is the value of  8 R6S3Q5P9 

If -4$1 = 4, 7$-7 = 49 and 3$1 = -3, then find the value of -8$-5 = ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?
12 + 10 - 28 ÷ 7 x 4 = 48

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 .