Quantitative Aptitude - Arithmetic Ability Questions

Sashi can do a piece of work in 20 days. Tanya is 25% more efficient than Sashi. The number of days taken by Tanya to do the same piece of work is:

The compound interest earned in two years at 8% per annum is Rs 4160. What is the sum (in Rs) invested?

What is the effective discount on two successive discounts of 20% and 25%?

If C = 1200 and D = 1500, then D is how much percent more than C?

Two successive discounts of 10% and 20% are equivalent to a single discount of

If cosec2 θ = 625/576, then what is the value of [(sin θ – cos θ)/(sin θ + cos θ)]?

The least number that must be subtracted from 1294 so that the remainder when divided by 9, 11, 13 will leave in each case the same remainder 6 is:

AB and AC are the two tangents to a circle whose radius is 6 cm. If ∠BAC = 60 deg, then what is the value (in cm) of √(AB2 + AC2)?