Quantitative Aptitude - Arithmetic Ability Questions

The average marks obtained by a group of 16 students was 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.5. What was the average marks obtained by the student who left and the one who joined?

In the given figure, PQRS is a square of side 20 cm and SR is extended to point T. If the length of QTis 25 cm, then what is the distance (in cm) between the centers O1 and O2 of the two circles?

The difference between cost price and selling price is Rs 576. If the profit percentage is 16%, then what is the cost price (in Rs)?

The effective annual rate of interest corresponding to a nominal rate of 15% per annum payable half-yearly is

If (4x - 3) - (2x + 1) = 4, then the value of x is

If cot(A/2) = x, then x is equal to

What is the equation of line whose slope is -1/2 and passes through the intersection of the lines x - y = -1 and 3x - 2y = 0?

Two labourers A and B are paid a total of Rs. 1120 per day. If A is paid 180 percent of what is paid to B, how much (in Rs) is B paid?