Quantitative Aptitude - Arithmetic Ability Questions

A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km/hr) of the boat in still water?

The mean of a distribution is 15 and the standard deviation is 5. What is the value of the coefficient variation?

An engineering student has to secure 25% marks to pass. He gets 56 and fails by 34 marks. Find the maximum marks.

After allowing a discount of 20% on Marked price Kishore makes a profit of 12%. What percentage is the Marked price above the Cost price?

What approximate value should come in place of the question mark (?) in the following equation (Note: You are not expected to calculate the exact value)?(55.01+16.0003)×22.01÷10.998 =?

Findout the odd word/letters/number/number pair from the given alternatives.
7 : 50 : : 9 : ?

Select the odd word/letters/number/number pair from the given alternatives.

If 9x2 + 16y2 = 60 and 3x + 4y = 6, then the value of xy is