Quantitative Aptitude - Arithmetic Ability Questions

A man spends 15% of his income. If his expenditure is Rs. 75, his income (in rupees) is:

The arithmetic mean of the marks scored by students of a class is 58. 20% of them secured a mean score of 60. The mean score of another 30% of the students was 40. The mean score of the remaining students is

If the sum of squares of three consecutive natural number is 2702. Then, what will be the middle number?

What is that least digit that must be added to the product 5786 × 5784 to make it a perfect square?

The smallest number that must be subtracted from 2800 so that the obtained number is a perfect square is

In triangle ABC, a line is drawn from the vertex A to a point D on BC. If BC = 9 cm and DC = 3 cm, then what is the ratio of the areas of triangle ABD and triangle ADC respectively?

The area of a semicircle is 1925 sq.cm. Calculate its perimeter (in cm).

There are a total of 200 students in a school, of which 7/10th are boys. Find the number of girls in the school.