Quantitative Aptitude - Arithmetic Ability Questions

R is 80% more efficient than S. If S alone can make a book in 90 days, then R alone can make the book in how many days?

Calculate the distance (in cm) of the chord from the centre of the circle, if the chord of length 48 cm is drawn in the circle of radius 25 cm.

In a mixture 25 liters, the ratio of milk and water is 4:1. How many liters of milk must be added to make the ratio 16:1?

ΔDEF is right angled at E. If cosecD = 5/4, then what is the value of cosecF?

8 x {5 - (-2) x (-3)} = ?

Simplify x5 ÷ x43 ÷ x

What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?

In ΔABC, ∠B is right angle, D is the mid point of the side AC. If AB = 6 cm, BC = 8cm, then the length of BD is