Quantitative Aptitude - Arithmetic Ability Questions

A rice trader buys 12 quintals of rice for Rs 1,870. 15% rice is lost in transportation. At what rate should he sell to earn 20% profit?

The average age of 40 students of a class is 16 years. If the average age of 24 students is 15.5 years and that of the 15 students is 16 2⁄3 years, then the age of 40th student is

If two successive discounts of 50% and 10% are offered, then what is the net discount (in %)?

Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

The reciprocal of the sum of the reciprocals of 2/9 and 7/10 is

On selling 56 chairs, Mohan earns profit equal to the selling price of 6 chairs. What is the profit percentage?

10 identical solid spherical balls of radius 3 cm are melted to form a single sphere. In this process 20% of solid is wasted. What is the radius (in cm) of the bigger sphere?

If x = 1/(√2+1) then the value of x2 + 2x - 1 is