The product of two consecutive even numbers is 168. Find the sum of the numbers?

If a shopkeeper buys 2 oranges for Rs.5 and sells 3 for Rs.7 only, then what percentage of loss and loss did he gain?

Find the sum of 2x terms of the series ( 1² - 2² + 3² - 4² + ___ ) 

Divide 50 into two parts so that the sum of their reciprocals is   $${1\over 12} $$

When 1062, 1134 and 1182 are divided by the greatest number .x, the remainder in each case is y. What is the value of (x − y)?

Directions: Find the wrong number in the following number series:

141, 156, 147, 162, 153, 165, 159

Adding 335 to 5A7 results in 8B2. The number 8B2 is divisible by 3. Accordingly, what will be the maximum possible value of A?

There are two numbers such that the first number is four times of the second mumber. If their average is 65, then what is the second number?