Fraction and Simplification, Average and Mean

The average of a family of 6 members is 25 years. After a 45 year old member leaves the family, what is the average age (in years) of the family?

The greatest of the 21 positive integers in a certain list is 16. The median of the 21 integers is 10. What is the least possible average (arithmetic mean) of the 21 integers ?

If 6 students have an average (arithmetic mean) score of 88 on an exam, and one of those students scored a 93 on the exam, what is the average score on this exam for the other 5 students ?

Find the average of all the number between 6 and 34 which are divisible by 5.

If b = 9d - c and d = (a/6), what is the average (arithmetic mean) of a, b, c and d?

Average of ten positive numbers is x. If each number increases by 10%, then x-

A motorist travels to a place 150 km away at an average speed of 50 km and returns at 30 km per hour. His average speed for the whole journey in km per hour is-

The average of five consecutive integers is X. If the next two numbers are added, how shall the average vary?

A, B, C, D and E are five consecutive numbers in increasing order of size. Deleting one of the five numbers from the set decreased the sum of the remaining numbers in the set by 20%. Which one of the following numbers was deleted?

In the first 20 over's of a cricket game, the run rate was only 3.5. What should be the run rate in remaining 30 over's to reach the target of 289 runs?

A cake is divided into 18 pieces. If Mohiuddin takes 1/3 of the cake and Morshed takes 1/3 of the rest that are left, how many pieces are still left?

If 2a = 3b = 4c = 72, then what is the average (arithmetic mean) of a, b and c?

The average weight of 17 students is 90 kg. If the weight of teacher is also included, then the average weight is increased by 200 grams. Find the weight of the teacher?

Person 1 to 4 receive equal shares of an income, while Person 5 receives half of what each of Persons 1 to 4 receives. If the total income is 18000 taka, how much does Person 5 get?

The average of 10 numbers is 40.2. Later it is found that two numbers have been wrongly added. The first one is 18 greater than the actual number and the second number added is 13 instead of 33. Find the correct average -

If Tk. 4,500 was invested in a share when the price per share was Tk. 9 and Tk. 3,000 was invested in another share when the price per share was Tk. 10. What was the average price per share purchased?

Average of six non-zero positive integers is 15 and the median is 18. The modal value is less than the median. What is the maximum possible value of the largest of the six integers?

The average runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings to increase his average of runs by 4?

The average of 7 consecutive numbers is 20. The largest of these number is -

Raisa took one cup of half olive-oil and half vinegar and poured it in a jar that had equal parts of olive-oil, vinegar, and water. If the result is a three-cup mixture of salad dressing, what portion of the dressing is olive-oil?