There are 120 students in a class, who read Maths or History or English. It is known that no student can read all three subjects. 24 read only Maths and History, 8 read only History and English and 21 read only Maths and English. 32 read only Maths and 13 only History. If 9 of the students who read only Maths start to read all three subjects, then find the percentage of students who read History?

In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.
15 - 6 + 10 x 3 ÷ 2 = ?

Some equations are solved on the basis of a certain system. Identify that operation and find out the correct answer from the four-response given.
a = 14 (290) 15, b = 16 (330) 17, c = 18 (?) 19

In each of the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?
( 3÷4 ) + 2=2 

Which of the following signs of equation are to be interchanged which will make the given equation correct?

5 + 6 ÷ 3 – 12 × 2 = 17

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
33 * 11 * 3 * 6 = 115 

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
7– 4 – 1 = 714, 9 – 2 – 3 = 932 8– 0–4 = ?  

Select the option in which the numbers do NOT share the same relationship as that shared by the given pair of numbers.
(98, 107, 125)