Quantitative Aptitude - Arithmetic Ability Questions

Point P (8 , 5) is the midpoint of segment AB. Co-ordinates of A are (5, y) and B are (x, -3). What is the value of x?

The mean score in a test of the 12 boys in a class was 16 while the overall mean of the 30 students in the class was 18.1. What was the mean score of the girls?

What is the value of (1/√3 + sin45 ) ?

In what ratio does the point T(x,0) divide the segment joining the points S(-4,-1) and U(1,4)?

The circumference of a circle is 110 cm. Find its radius (in cm).

A and B have their annual average income Rs. 80,000.
B and C have their annual average income Rs. 75,000.
C and A have their annual average income Rs. 78,000.

The annual income of A is ?

What number should be added to each of 4, 16, 18 and 58 so that the resulting numbers will be in proportion in the given order?

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.