RRB RPF RPSF SI and CONS Model Papers 6 with solutions

Question : 1 of 120

Marks: +1, -0

The average of two consecutive even numbers is n – 1. If the next two consecutive even numbers are also included, the average of the four numbers will_____.

decrease by 1
remains same
increase by 1
increase by 2

Validate

Solution:

(4) Let two consecutive even numbers be x and

x + 2

.
Average of 2 numbers

= {x+x+2}/{2}

= {2 x+2}/{2}

=x+1

Let four consecutive even numbers be

x, x + 2, x + 4

and

x + 6

.
Their average

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

= {4 x+12}/{4}

=x+3

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