An office opens at 10 am and closes at 5 pm. The lunch break is of 30 minutes. What is the ratio of lunch break and total office hours?

The number of girls in a class is 20% more than the number of boys. There are total 66 students in this class. If 4 more girls are admitted in the class, then the ratio of the number of boys and girls will be?

The ratio of the heights of Ram and Rahim is 7 : 8. If Rahim's height is 66 inches, then the height of Ram is?

3¹¹ + 3¹² + 3¹³ + 3¹⁴ is divisible by which of the following?

The mean of 20 items is 55. If two items 45 and 30 are removed, what will be the new mean of the remaining items?

If the circumradius of an equilateral triangle ABC is 8 cm, then what is the height of the triangle?

A works 7 hours a day at the rate of 180 per hour. B works 5 hours a day at the rate of 160 per hour. What is the ratio of daily earnings of A and B?

The two vowels touch each other internally. Their radii are 2 cm and 3 cm. What will be the length of the largest chord of the bigger circle outside the inner circle?