Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd letters from the given alternatives.

Find out the odd word/letters/number/number pair from the given alternatives.

2sin[(C+D)/2].cos[(C­-D)/2] is equal to

Simplify 81x2 - 49y29x + 7y

A box consist of 5 rupees, 2 rupees and 1 rupee coins and their value are in the ratio of 15 : 4 : 2 respectively. If there are total 112 coins, then how many 2 rupees coins are there in the box?

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 average salary of all workers in a workshop is Rs.12000. The average salary of 7 technicians is Rs.15000 and the average salary of the rest is Rs.9000. The total number of workers in the workshop is

The ratio between Ram's age and Rahim's age is 10:11. What is the age of Rahim in percentage of Ram's age