Quantitative Aptitude - Arithmetic Ability Questions

If 10 people can do a job in 20 days,then 20 people with twice the efficiency can do the same job in

Manoj can do a piece of work in 42 hours. If he is joined by Jayashree who is 100% more efficient, in what time they will finish the work together?

Pramod can paint a wall red in 12 hours while Brajen can whitewash the wall completely in 16 hrs. If Pramod and Brajen work alternately for an hour each starting when the wall has just cement on it till when it is completely painted red, how many hours will it take to paint the entire wall red?

The number 3521is divided by 8. What is the remainder?

∆PQR is right angled at Q. If m∠R = 45°, then find the value of (cosecP - √3/2)

A bag has Rs 43 in the form of 5-rupee, 50-paise and 10-paise coins in the ratio of 1:5:11. What is the total number of 50-paise coins?

If a2sec2x - b2tan2x = c2 then the value of sec2x + tan2x is equal to (assume b2 ≠ a2 )

The maximum value of 5+20x-4x2, when X is real number