Quantitative Aptitude - Arithmetic Ability Questions

When a number is increased by 69, it becomes 103% of itself. What is the number?

Select the odd word/letters/number/number pair from the given alternatives.

If cot(A/2) = x, then the value of x is

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.

Select the odd word from the given alternatives.

If a + b + c = 27, then what is the value of (a – 7)3 + (b – 9)3 + (c – 11)3 – 3(a – 7)(b – 9)(c – 11)?

25% discount is offered on an item. By applying a promo code the customer wins 8% cash back. What is the effective discount?

If cot A = n/(n + 1) and cot B = 1/(2n + 1), then what is the value of cot (A + B)?