Quantitative Aptitude - Arithmetic Ability Questions

If 2x - 3(2x - 2) > x - 1 < 2 + 2x; then x can take which of the following values?

The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The 15th observation is

The sum of ages of 4 children born at intervals of 4 years each is 60. What is the age of the youngest child?

A can do a piece of work in 20 days and B in 15 days. With help of C, they finish the work in 5 days. C can alone do the work in

A can do a work in 20 days and B in 10 days. If they work on it together for 5 days, then what fraction of work is left.

Manjeet can do a work in 18 hours. If he is joined by Jaya who is 100% more efficient, in what time will they together finish the work?

A mixture of 50 kg of cement and gravel contains 10% of gravel. How many kg of gravel must be added to make the gravel content 28% in the new mixture?

The average weight of P, Q and R is 47 kg. If the average weight of P and Q be 32.5 kg and that of Q and R be 48.5 kg, then what is the weight of Q (in kgs)?