10
15
20
25
Answer is Right!
Answer is Wrong!
The correct answer is (a) 10.
The mean of A, B, C, D and E is 50. This means that the sum of A, B, C, D and E is 50 * 5 = 250.
The mean of B, C, D and E is 60. This means that the sum of B, C, D and E is 60 * 4 = 240.
We know that A is not included in the sum of B, C, D and E, so the value of A must be 250 – 240 = 10.
Option (b) is incorrect because 15 is not a multiple of 5.
Option (c) is incorrect because 20 is not a multiple of 5.
Option (d) is incorrect because 25 is not a multiple of 5.