Quantitative Aptitude - Arithmetic Ability Questions

If selling price of 39 articles is equal to the cost price of 42 articles, then what will be the profit percentage?

The sum of the digits of a 2-digit number is 11. If we add 45 to the number, the new number obtained is a number formed by interchange of the digits. What is the number?

Rs. 750 invested for 3 months gave an interest of Rs. 18. What was the simple rate of interest per annum?

In a class of 60 students there are 30 girls. The average weight of these girls is 58 Kg and average weight of the full class is 63 kgs. What is the average weight of the boys of the class?

The area of a rectangle in 60 sq.cm and its perimeter is 34 cm, then the length of the diagonal is

The length of the diagonal of a square is 14 cm. What is area of this square?

The angles of a triangle are in the ratio 1 : 1 : 4. If the perimeter of the triangle is k times its largest side, then what is the value of k?

If θ is positive acute angle and 4sin2θ = 3, then the value of tan θ - cot θ/2 is