Of the three numbers, the first is twice the second and the second twice the third. The average of these numbers is 21. ind the largest number out of these.
Answer: C Total runs in first 10 overs = 10*3.2 = 32 Run rate in remaining 40 overs = (282-32)/40 = 6.25
Q. No. 10:
In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. The percentage of the girls in the class is
Answer: B Let the number of boys be x and that of girls be y, then total score of boys = 71x total score of girls =73y (71x+73y) / (x+y) = 71.8 x/y = 3/2 % of girls in the class = 2/5 * 100 = 40%
Q. No. 11:
The average of 10 numbers is 40.2. Later it is found that two numbers have been wrongly added. The first is 18 greater than the actual number and second number added is 13 instead of 31. Find the correct average.
Answer: A Sum of 10 numbers =402 Correct sum of 10 numbers = 402 -13 +31 -18 =402 Hence new average = 402/10 = 40.2
Q. No. 12:
The average salary of all the workers in a workshop is Rs 8000. The average salary of 7 technicians is Rs 12,000 and the average salary of the rest is Rs 6,000. The total number of workers in the workshop is