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Sum of first 12 numbers = (12 x 80) = 960 Sum of last 5 numbers = (110 x 5) = 550 Sum of 11th and 12th number = (960 - 550) = 410 So, 12th number = 410 x (7/20) = 143.5
Average of 20 numbers is 90. Average of first 8 numbers is 125 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numb...
A class of 30 students appeared in a test. The average score of 12 students is 80, and that of the rest is 75. What is the average score of the class?
"In a group of four investors in stocks, the highest earner makes Rs. 5 lakh per month, while the lowest earner makes Rs. 2.4 lakh per month. Now, we wa...
Average of 12 observations calculated by a student was 60 but when he again went through his observations he realised that he took value of three observ...
The average profit of a shop for the first 3 months is Rs.500 per month. If the shop owner wants the average profit to be Rs.800 per month over 6 months...
The average cost price of articles 'P' and 'Q' together is Rs. 280, where the cost price of article 'Q' is Rs. 40 more than that ...
If the average of 38, 49, 42, and 'b' is 50, then find the value of '2b'.
The average score of five students is 24. When the scores of two additional students are included, the average drops by 2. What is the combined total o...
The average age of a group of 50 students is 16 years. If 3 students whose ages are 18 years, 26 years, and _____ years are replaced by 3 new students w...
There are 5 consecutive odd and 3 consecutive even numbers. The sum of five consecutive odd numbers is 120 and the lowest even number is 4 more than the...
