Quantitative Aptitude - Arithmetic Ability Questions

Jaikishen can do a piece of work in 15 hours. If he is joined by Jhanvi who is 50% more efficient, in what time will they together finish the work?

In ∆ ABC, the height CD intersects AB at D. The midpoints of AB and BC are P and Q respectively. If AD = 8 cm and CD = 6 cm, then the length of PQ is?

If x = y + 2 then x3 - y3 - z3 is

If a2+1a2 = 38, then find the value of a-1a?

The inradius of a equilateral triangle is 10 cm. What is the circum-radius (in cm) of the same triangle?

If aq-r+br-p-cp-q, then find the value of (pa + qp + rc) is

If 2+aa + 2+bb + 2+cc = 4, then the value of ab+bc+caabc is

In ΔABC, AC = BC and ∠ABC = 50°, the side BC is produced to D so that BC = CD then the value of ∠BAD is