Question no 1749 SSC CGL Tier 1 Quantitative Aptitude Questions and Answers Free Online Mock Test 43

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1 .

The average of some natural numbers is 15. If 30 is added to first number and 5 is subtracted f rom the l ast number the average becomes 17.5 then the number of natural number is ?

[ A ] 10
[ B ] 30
[ C ] 20
[ D ] 15

Answer : Option A

Explanation :

The average of nnatural number = 15
New average of nnatural numbers = 17.5
ATQ,
(17.5) n = (15)n+ 30 – 5
17.5n– 15n = 25
n = 10

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