In a row of boys, if A who is 10th from the left and B who is 9th from the right, interchange their positions, A becomes 15th from the left. How many boys are there in the row ?

Which of two signs when interchanged makes the following equation correct? 7 ÷ 8 × 2 − 16 + 2 = 15

If a ÷ b means 'a to be added to b' and a × b means 'a to be divided by b', then the value of (14 ÷ 7) ÷ (14 × 7) is

Which of the following two signs needs to be interchanged to make the given equation correct? 24 − 8 / 4 + 5 × 3 = 14

In an examination, a student gets 4 marks for every correct answer, 1 for every unattempted question and 0 for every wrong answer. If there are 30 questions, which of the following total scores is no…

If a * b = ab + b - a, what is the value of c such that c * (2 * 5) = 97?