Quantitative Aptitude - Arithmetic Ability Questions

Δ LMN is right angled at M. If m∠N = 60 deg., then Tan L =______.

Factorise 24x2 - 54x - 15

If the selling price is doubled, the profit triples. The profit percent is

A can do a piece of work in 10 days and B can do it in 12 days. They work together for 3 days. Then B leaves and A alone continues. 2 days after that C joins and the work is completed in 2 days more. In how many days can C do it, if he works alone ?

If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?

X, Y and Z can do a piece of work in 30, 40 and 50 days respectively. All three of them began the work together but Y left 4 days before completion of the work. In how many days was the work completed?

The average marks in science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 of the actual marks 72 and 61 respectively, then what would be the correct average?

The area of an equilateral triangle is 9√3 sq cm, find height of the triangle?