Quantitative Aptitude - Arithmetic Ability Questions

If sin(A/2) = x, then the value of x is

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

A shopkeeper by selling 13 Titan watches, earns a profit equal to the selling price of 3 Titan watches. His profit percentage is

The ratio of present ages of Raman and Lamba is 7 : 5. After 6 years age of Raman will be 48 years. What is the present age (in years) of Lamba?

What is the value of sin ­-300°?

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?

If x+1x=5,then the value of x1+x+x2 is

If 3√2 + √18 + √50 = 15.55, then what is the value of √32 + √72?