Quantitative Aptitude - Arithmetic Ability Questions

In a mixture of milk and water, there is 19% milk. If the quantity of milk in the mixture is 437 mililitres, then what is the total quantity (in millilitres) of mixture?

Selling price of an article is Rs 494 and discount of 5% is offered. What is the marked price (in Rs)?

What is the fourth proportional to 6, 24 and 83?

If (4x -­ 5) = (3x ­- 1), then the numerical value of (x + 4)2

If x + √5 = 5 + √y, and x, y are positive integers, then the value of x+yx + y

The sides of a triangle are in the ratio 1/2 : 1/3 : 1/4 and its perimeter is 104 cm. The length of the longest side (in cm) is

Find the standard deviation of {11, 7, 10,13, 9}

If 3x + 5y + 7z = 49 and 9x + 8y + 21z = 126, then what is the value of y?