Quantitative Aptitude - Arithmetic Ability Questions

P and Q together can make a door in 12 days. They started the work together but after 8 days P left the work. The remaining work is completed by Q alone in 7 more days. In how many days can P alone complete the entire work?

A sum of money (P) doubles in 10 years. How much would it be in 20 years at the same rate of simple interest?

Find the curved surface area (in cm2) of a right circular cylinder of diameter 28 cm and height 12 cm.

If x - y = -8 and xy = 45, then (x2 + y2) is

If x2+5x+6 = 0, then the value of 2xx2-7x+6 is

If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is

What is the area (in sq cm) of an equilateral triangle of side 14 cm?

The arithmetic mean of the marks scored by students of a class is 58. 20% of them secured a mean score of 60. The mean score of another 30% of the students was 40. The mean score of the remaining students is