SSC CGL Tier II 12 Jan 2017 Paper 1

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Question : 5 of 100

Marks: +1, -0

A boy found the answer for the question “subtract the sum of

1 /4

and

1/ 5

from unity and express the answer in decimals” as 0.45. The percentage of error in his answer was

$( 100 /11) %$
50%
10%
$(200/ 11) %$

Solution:

(4) Correct answer

=1-\ ( {1}/{4}+ {1}/{5} )

=1- ( {5+4}/{20} )

=1- {9}/{20}= {11}/{20}

Incorrect answer

=0.45= {45}/{100}

= {9}/{20}

Error

= {11}/{20}- {9}/{20}= {2}/{20}= {1}/{10}

Percentage error

=\ ( { {1}/{10}}/{ {11}/{20}} ) ×100

= {1}/{10} ×{20}/{11}× 100= {200}/{11} \%

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