Averages and Mixtures Test for SSC CGL

The average of 27 numbers is zero. Out of them, how many may be greater than zero, at the most?

Ras Bihari, a plumber, earned on an average ₹925 per day in the month of January. He earned on an average ₹881 per day during the first 20 days and ₹915 per day during the last 20 days. What was his average income (in ₹) per day from 12th January to 20th January?

The average of ten numbers is 32.5. The average of the first four numbers is 25.6 and that of the last three numbers is 38.2. The 5th number is 50% more than the 6th number and 8 less than the 7th number. What is the average of the 5th and 7th numbers?

In a set of three numbers, the average of first two numbers is 21, the average of the last two numbers is 24, and the average of the first and the last numbers is 15. What is the average of three numbers?

What is the average of the first six prime numbers?

Of the three numbers, second is one-third of first and is also three-fourth of the third number. If the average of three numbers is 112, then what is the smallest number?

The average of x occurring 5 times and y occurring 7 times is 37. Also, the average of x occurring 7 times and y occurring 5 times is 35. The value of y is:

The sum of three consecutive even numbers is 28 more than the average of these three numbers. The smallest of these three number is:

In a class, the average score of thirty students in a test is 69. Later on, it was found that the score of one student was wrongly marked as 88 instead of 58. The actual average score is:

The average weight of a certain number of students in a group is 72 kg. If 10 students having an average weight of 78kg leave and 4 students having an average weight of 80 kg join the group, the average weight of the students in the group decreases by 0.7 kg. The number of students initially in the group is: