Quantitative Aptitude - Arithmetic Ability Questions

Two pipes X and Y can individually fill a tank in 48 and 72 min respectively. If they are opened simultaneously, how long will it take for the tank to fill? 

The difference between Peter and Preeti's ages is 5 years. When they married each other 35 years ago, 4 times Peter's age was the same as 5 times the age of Preeti. What is the current sum of their ages?

The simple interest on a certain sum of money invested at a certain rate for 2 years amounts to Rs. 1200. The compound interest on the same sum of money invested at the same rate of interest for 2 years amounts to Rs. 1290. What was the principal?

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

The 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?

What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?

In a triangle ABC, the length of in-radius and circum-radius is 2 units and 6 units respectively. Find the distance (in units) between the in-centre and circum-centre.

If tanθ = 815, then 1-sinθ1+sinθ is