Quantitative Aptitude - Arithmetic Ability Questions

Find the compound interest on Rs. 62500 at 21% per annum for 1.5 years.

Findout the odd word/letters/number/number pair from the given alternatives.
23 : 8 : : 62 : ?

$$\begin{gathered} 3x2-14x+16=0 \\ 5y2-16y+12=0 \end{gathered}$$

If A = 2B = 4C; what is the value of A : B : C?

A shopkeeper allows 25% discount on the marked price of an article and he suffered a loss of 15%. What will be the profit percent if the article is sold at marked price?

There are five boxes in a cargo hold. The weight of the first box is 200 kg and the weight of the second box is 20% higher than the weight of the third box, whose weight is 25% higher than the first box’s weight. The fourth box at 350 kg is 30% lighter than the fifth box. Find the difference in the average weight of the four heaviest boxes and the four lightest boxes.

The average of four consecutive odd numbers is 40. What is the largest number?

Seven years from now Virat will be twice as old as Mohinder. Five years ago Mohinder's age was one year less than 2/5 of Virat's age. What is Virat's present age?