Quantitative Aptitude - Arithmetic Ability Questions

What is the simplified value of 0.042+0.212-0.00840.043+0.213

Find the value of 27a3 + 1a3, if 9a2 + 1a2 = 43

What is the ratio of radius of incircle and circumcircle for an equilateral triangle with an area of 22√3 sq. units?

The standard deviation of the set {10, 11, 12, 9, 8} is

In the following question, select the odd number pair from the given alternatives.

A box of 20 items was bought for Rs. 6,400 after a discount of 20%. Find the cost of each item.

Out of two numbers, 30% of the smaller number is equal to 18% of the larger number. If the sum of the two numbers is 840, then what is the value of the larger number?

The value of tan(-405°)