Quantitative Aptitude - Arithmetic Ability Questions

A book seller allowed 10% discount on printed price. He gets 30% commission from publisher. His profit in percent will be

15 years ago Cynthia was thrice as old as Brittany. The sum of their present ages is 94 years. How old is Brittany now?

The marked price of an article is Rs 960 and it is sold at a discount of Rs 192. What is the discount percentage?

The weights of two iron balls are 3.5 kg and 7.5 kg. What is the percentage weight of the 1st ball with respect to 2nd ball.

If x - 1/x = 1 then what is the value of 1x1x-1-1x+1+1x2+1-1x2-1?

If 2secA - (1 + sinA)/cosA = x, then the value of x is

If A is 40% more than B, then B is how much percent less than A?

0 is the circumference of a triangle ∆ABC. The point A and the chord BC are on the opposite side of O. If ∠BOC=150° then the value of ∠BACis