Quantitative Aptitude - Arithmetic Ability Questions

Which pair is not similar to the other three?

In a rhombus _____.

The square root of 3249 is

The number of sides of a regular polygon whose exterior angles are each 72 deg is

If Rs. 87 was divided between James and Radha in the ratio 1: 2, how much money did Radha get?

Product of digits of a 2-digit number is 18. If we add 63 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

Simple interest on a certain sum of money for 3 years at 5% per annum is Rs. 5250. What will be the compound interest on that sum at the same rate for the same period?

An equal sum is invested in two different schemes. One scheme gives simple interest and the other gives compound interest (annual compounding). The total interest obtained after 2 years from both the schemes together is Rs 2090. If both the schemes have 18% per annum interest rate, then what is the first year interest (in Rs) of simple interest scheme?