Quantitative Aptitude - Arithmetic Ability Questions

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

A trader buys 500 kgs of cotton for Rs 9,000. 10% of this cotton is spoiled due to rain. At what rate (Rs/Kg) should he sell the rest to earn 10% profit?

The total cost of a stove with cooker was Rs 13,125. The cooker was sold at a profit of 30% and the stove at a loss of 20%. If the sale price was the same in both the items, then the cost price of the cheaper item was

The sum of a non-zero number and ten times its reciprocal is 7. Find the number.

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

What is the area (in sq cm) of an equilateral triangle of side 6 cm?

The circumference of a circle is 88 cm. Find its radius (in cm).

The sum of a number and 4 times its reciprocal is 5. What is the number?