alleryStart learning →The numbers 10, 15, x and 25 have an average of 17. Find x.
A16
B15
C20
D18
Answer & Solution
Correct answer: D. 18
The total must be 68 and the known numbers give 50, so x = 18.
Keep practising Averages
Browse all Averages questions for SSC CGL, or explore more Quantitative Aptitude topics.
Related questions
Two equal-sized groups have means 40 and 60. What is the mean of the two groups combined?For heavily skewed data such as personal incomes, which average is usually reported?In teaching, which three measures are sometimes called 'the three Ms' of average?The simple arithmetic mean is a special case of a weighted average in which the weights arWhat defines a weighted mean?Per capita income of a nation is best described as which of these?What does the plain arithmetic mean of 1 degree and 359 degrees give for these two angles?For which data set are the mean and the median always equal?