Quantitative Aptitude - Arithmetic Ability Questions

3cosA is equal to

Product of digits of a 2-digit number is 72. If we add 9 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

Two circles are drawn with the same centre. The circumference of the smaller circle is 44 cm and that of the bigger circle is double the smaller one. What is the area between these two circles?A. 154 square cmB. 308 square cmC. 462 square cmD. 616 square cm

The largest chord of the circle has a length of 20.4 cm. The radius of the circle will be_____.

BD and CE are two medians of the triangle ABC. If EO = 7 cm, then the length of CE is

If the cost price of 20 books is the same as selling price of 25 books, then the loss percentage is

Some masons promised to do a work in 10 days but 8 of them were absent and remaining did the work in 18 days. What was the original number of masons?

Monika's father was 38 years of age when she was born while her mother was 36 years old when her brother four years younger to her was born. What is the difference between the ages of her parents?