Quantitative Aptitude - Arithmetic Ability Questions

The salary of a person is reduced by 20% . To restore the previous salary, his present salary is to be increased by

Koushik can do a piece of work in X days and Krishnu can do the same work in Y days. If they work together, then they can do the work in

Two chords AB and CD of a circle with centre O intersect at P. If ∠APC = 40°. Then the value of ∠AOC + ∠BOD is

What is the largest 4 digit number which is exactly divisible by 81?

The vertical angle A of an isosceles triangle ΔABC is three times the angle B of it. The measure of the angle A is

Shivam is 10% less efficient than Vivek. If Vivek can make a helmet in 9 days, then in how many days Shivam can complete the same work?

ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right –angel. 
What is the area of triangle ADC?

Find the odd word/letters/number pair from the given alternatives