Quantitative Aptitude - Arithmetic Ability Questions

Simple interest on a sum for 5 years is equal to 20% of the principal. In how many years interest will be equal to the principal?

What is the value of tan 1° tan 2° tan 3°....... tan 89°?

What is the value of Sin 60° + (1/2)Cosec 45°?

If 7x + 6y = 5xy and 10x ­- 4y = 4xy, then value of x and y is

In the following question, four number pairs are given. The number on left side of (–) is related to the number of the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

The area of the circle with radius Y is W. The difference between the areas of the bigger circle (with radius Y) and that of the smaller circle (with radius X) is W'. So x/y is equal to

PQR is an equilateral triangle whose side is 10 cm. What is the value (in cm) of the inradius of triangle PQR?

When a number is increased by 18, it becomes 106% of itself. What is the number?