Quantitative Aptitude - Arithmetic Ability Questions

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 cosecA - cotA = x, then the value of x is

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

Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. The ratio between the capacity of a man and a woman is

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

Manish, Mukesh and Sachin are Accountants. Mukesh can filea return in 5 hours and Sachin in 4 hours alone. All three together can do it in 2 hours. In what time (in hrs) will Manish do the work?

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

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