Quantitative Aptitude - Arithmetic Ability Questions

What is the value of 1+aa1/2+a-1/2-a1/2+a-1/21+a+a-1/2 ?

Two numbers are 90% and 75% lesser than a third number. By what % should the first number be increased so that it becomes equal to the second number?

Simplify the equation 0.733+0.2730.732+0.272-0.73×0.27

If 7x - (3/2) * (4x - 9) = 6.5, then the value of x is?

In a class there were 28 boys and some girls. In a test the mean score obtained by the boys was 12.5 while that obtained by the girls was 14.5. If the overall average was 13.1, what was the total number of students in the class?

Selling price of an article is Rs 1144. If loss percentage is 12%, then what is the cost price (in Rs) of article?

A train moves at the speed of 40 m/s and crosses a bridge of length 550 metres in 25 seconds. What is the length (in metres) of the train?

A person lent certain sum of money at 10% per annum simple interest. In 20 years the interest amounted to Rs 500 more than the sum lent. What was the sum lent (in Rs)?