Quantitative Aptitude - Arithmetic Ability Questions

Tanzeem spent 1/5 of his salary on his friends, 1/10 of his salary on accommodation and 1/4 of his salary on savings. If he has Rs. 1800 left in his wallet,then find his total expenditure on accommodation and savings.

Of the 3 numbers whose average is 22, the first is 3/8th the sum of other 2. What is the first number?

If a boat goes a certain distance at 30 km/h and comes back the same distance at 20 km/hr, what is the average speed (in km/hr) for the total journey?

Slope of the side DA of the rectangle ABCD is 5/3. What is the slope of the side AB?

If  tan2θ + cot2θ = 2, then what is the value of 2sec θ cosec θ?

If 1 shirt is offered free on purchase of 3 shirts priced Rs 500 each, then what is the effective discount on each shirt?

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 506, then what is the difference between the first and the third number?

The value of 2 Tan53°Cot37°-Cot80°Tan10° ?