Question

Average of four numbers is 28. Sum of smallest and largest number is 57. If difference between other two numbers is 1, then find the square of second smaller number.

A 484 Correct Answer Incorrect Answer
B 196 Correct Answer Incorrect Answer
C 225 Correct Answer Incorrect Answer
D 441 Correct Answer Incorrect Answer
E 729 Correct Answer Incorrect Answer

Solution

Let four numbers in increasing order is a, b, c and d. => a + b + c + d = 4 x 28 = 112 => a + d = 57 => b + c = 55 According to question, => c – b = 1 => b = 27, c = 28 => b² = 729

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