Quantitative Aptitude - Arithmetic Ability Questions

The average marks of 45 students is shown as 65. It includes a wrong entry of 84 marks instead of 48 marks. The correct average is:

If 3a=4b=6c and a+b+c=279 then a2+b2+c2 is equal to

The mean of marks secured by 50 students in division A of class X is 61, 25 students of division B is 57 and that of 50 students of division C is 55. What will be the mean of marks of the students of three divisions of Class X?

For an article the profit is 190% of the cost price. If the cost price increase by 10% but the selling price remains same, then profit is what percentage of selling price (approximately)?

For the inequation x^2–7x + 12 > 0, which one of the following is correct ?

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

The area of an equilateral triangle is 9√3 sq cm, find its perimeter?

If 3x - 10 = -(2x + 5), then the numerical value of (x - 4)3 is