Quantitative Aptitude - Arithmetic Ability Questions

The average of 7 numbers is 30. If the average of first three numbers is 25 and that of last three numbers is 35, then what is the fourth number?

If an equilateral triangle has side 12 cm, then what is the difference (in cm) between the circumradius and inradius?

Select the odd word/letters/number/number pair from the given alternatives.

4 + 16 x -12 x 24 - 13 - 3 ÷ 20 - 4 = ?

Find the products : 0.5 x 0.05 x 0.005 x 500

A discount of 45% on an article is equal to the discount of 65% on other article. What is the respective ratio of the marked price of both the articles?

A ladder 13 m long reaches a window which is 12 m above the ground on side of a street. Keeping its foot at the same point, the ladder is turned to the other side of the street to each a window 5m high, then the width of the street is :

Select the odd word/letters/number/number pair from the given alternatives.