RRB RPF RPSF SI and CONS Model Papers 1 with solutions

Question : 22 of 120

Marks: +1, -0

The average of 20 numbers is 15 and the average of first five is 12. The average of the rest is

Solution:

(a) If the average of remaining numbers be x, then

20 × 15 = 5 × 12 + 15x

⇒ 300 = 60 + 15x

⇒ 15x = 300 – 60 = 240

⇒ x = { 240 }/ { 15 } = 16

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