RRB Junior Engineer Stage 1 Model Papers 7

Question : 10 of 100

Marks: +1, -0

The average of some natural numbers is 15. If 30 is added to first number and 5 is subtracted from the last number the average becomes 17.5 then the number of natural number is:

Validate

Solution:

Let number of natural numbers be x

∴ 15x + 30 – 5 = 17.5 x

25 = 2.5x

x=25/2.5×10

So 10 natural numbers are there.

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