Quantitative Aptitude - Arithmetic Ability Questions

Three solid spheres have their radii r1, r2 and r3. The spheres are melted to form a solid sphere of bigger radius. Then the radius of the new sphere is

What is the value of [(cos 7A + cos 5A)÷(sin 7A – sin 5A)]?

The price of an article is discounted by 25%, to restore to its original value, the new price must be increased by

A number is divided into two parts in such a way that 30% of first part is 25 more than the 20% of second part. 50% of second part is 33.5 more than the 60% of first part. What is the number?

Reflection of the point (2,­7) in the y­axis is

What is the value of (91 + 92 + 93 + ......... +140)?

The ratio of the number of marbles that Joyee and Minati had was 5 : 8 while the ratio of the number of marbles that Jacob and Minati had was 7 : 12. What is the ratio of the number of marbles that Joyee and Jacob had?

What is the equation of a line which has 3 as x-intercept and -5 as y-intercept?