Question
Average 20 numbers is ‘x’. If the average of
first 12 numbers is 62.5 while average of last 5 numbers is 84.8 and 13th, 14th and 15th numbers are (3x - 49), (x + 52) and 183 respectively. Find the 14th number.Solution
According to question, => 20x = 62.5 × 12 + 84.8 × 5 + 3x – 49 + x + 52 + 183 => 16x = 1360 => x = 85 Therefore, 14th number = 85 + 52 = 137
The average weight of 4 persons is 36 kg. The heaviest person’s weight is 26 kg more than the lightest person’s weight. If the average weight of the...
Suresh received 100, 92, 85, 97, 90 and 88 marks in his semester exams. What is his average score?
There are 4 numbers – A, B, C & D. B is 25% more than A and D is equal to average of A & C. Ratio of A to C is 3 : 4 and C is 5 more than B. Find valu...
Find the average of five numbers a, b, c, d and e such that b = 20, and a is 20% more than that of ‘b’. ‘c’ is 10 less than &ls...
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...
A cricketer whose bowling average is 24.85, runs per wicket, takes 5 wickets for 52 runs and thereby decreases his average by 0.85. The number of wicket...
The average weight of 44 employees in an office is 45 kg. When the manager's weight is included, the average weight rises by 1 kg...
The average age of three children is 14 years. If their ages are in the ratio 1:2:3. Find the age of the youngest child.
The average expenditure of a man for the first 4 month is Rs.5000 and for the next 8 months is Rs.8000. If he saves 12000 in that year then find his ave...
5 positive numbers are written on a piece of paper. Sum of first 3 numbers is 40 and ratio of the 4th and the 5th number is 2:3. If difference between t...
Relevant for Exams:
