Quantitative Aptitude - Arithmetic Ability Questions

The average marks obtained by a group of 10 students were 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.6. What were the average marks obtained by the student who left and the one who joined?

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

If w : 0.80 :: 9 : 6, w = ?

If the value of √42 is approximately 6.480, then what is the approximate value of √(6/7)?

ΔABC is right angled at B. If m∠A = 45 deg, then find the value of (tanC + √3/2).

A sum of Rs 6000 becomes Rs 7200 in 2 years, when invested in a scheme of simple interest. If the same sum is invested in a scheme of compound interest with same yearly interest rate (compounding of interest is done yearly), then what will be the amount (in Rs) after 3 years?

A number exceeds its 1/6 by 30. What is the number?

What is the area (in sq cm) of an equilateral triangle of side 14 cm?