Quantitative Aptitude - Arithmetic Ability Questions

A mixture contains acid and water in the ratio of 7 : 3. If 4 litres of water is added to it, then the ratio of acid and water becomes 7 : 4. What is the quantity (in litres) of acid in the mixture?

Which of the following is NOT prime number?

There are two numbers such that the first number is half of the second number. If their average is 57, then what is the first number?

The volume of metallic cylindrical pipe of uniform thickness is 748 c.c. Its length is 14 cm and its external radius is 9 cm. The thickness of the pipe is

The ratio of cost price and selling price 25:26. The percent of profit will be

Find the odd numbers/letters/numbers from the given alternatives.

If x = 1 + √2 + √3 , then the value of 2x4 - 8x3 - 5x2 + 26x - 28 is

If the roots of the equation a(b – c)x2 + b(c – a)x + c(a – b) = 0 are equal, then which of the following is true?