RRB Junior Engineer Stage 1 Model Papers 5

Question : 12 of 100

Marks: +1, -0

The average of four consecutive even numbers is 9.Find the largest number.

Solution:

Let the consecutive even numbers are

2n, 2n + 2,2n + 4

and

2n + 6

Average

={2n+2n+2+2n+4+2n+6}/4

8n + 12 = 4 × 9 ⇒ n = 3

Hence, the numbers are 6, 8, 10 and 21. Largest among them is 12

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