Quantitative Aptitude - Arithmetic Ability Questions

The areas of two similar triangles ΔABC and ΔPQR are 121 sq cms and 64 sq cms respectively. If PQ = 12 cm, what is the length (in cm) of AB?

In a ∆ABC, BC is extended upto D, ∡ACD =120°, ∡B = 1/2 A. Then ∡A is

What is the average of all natural numbers from 21 to 39?

If 2x-2x=1 (x≠0),then the value of x3-1x3 is

A can do a piece of work in 10 days, B can do it in 12 days and C can do it in 15 days. In how many days will A, B and C finish it, working all together?

O is the orthocentre of∆ABC, and if ∠BOC = 110° then ∠BAC will be

If a1-2a+b1-2b+c1-2c = 12, then 11-2a+11-2b+11-2c value is

A book is sold at three successive discounts of 20%, 20% and 10%. What is the net discount (in percentage)?