Question 143
The average of five numbers is 56.4. The average of the first and the second number is 53. The average of the fourth and the fifth number is 56. What is the third number ?
Solution
Average of 5 numbers is given as 56.4
Total of 5 numbers = Average x Number of Elements
Total of 5 numbers = 56.4 x 5 = 282
Average of 1st and 2nd number is 53
Total of 1st and 2nd number = 53 x 2 = 106
Average of 4th and 5th number is 56
total of 4th and 5th number = 56 x 2 = 112
1st + 2nd + 3rd +4th +5th = 282
106 + 3rd + 112 = 282
3rd = 64
hence option E is correct
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