Quantitative Aptitude - Arithmetic Ability Questions

In a triangle XYZ , which of the following conditions is true

A sum becomes Rs 10000 in 10 years on simple interest at the rate of 10% per annum. What is the total interest (in Rs) of the 10 years?

The average age of 19 boys in a class is 21 years. If the teacher's age is included, the average increases to 22 years. What is the teacher's age?

ABCD is a cyclic quadrilateral ∠DBA=50° and ∠ADE=33°, then the measurement of ∠BCD is

In the following question, select the odd letter/letters from the given alternatives.

If xy+yz+zx = 1, then the value of (1+y2)(x+y)(y+z) ?

Rs. 3105 is due to be divided among K, L and M in the proportion of 2/3 : 3/4 : 1/2 respectively. How much will L get?

a and b are irrational numbers such that a+b = q is a rational number; then a­b is