BPSC 65th Re Prelims Exam 17 Feb 2020 Solved Paper

Question : 142 of 150

Marks: +1, -0

1/8

parts of a pencil are black, remaining

1/ 2

part is white and the remaining

3{1/ 2} {cm}

is blue, find the total length of the pencil

Solution:

From the question

\;{1}/{8}

part is black

\;{1}/{2}(1-\;{1}/{8})=\;{1}/{2} × \;{7}/{8}=\;{7}/{16}

part is white
Remaining

(\;{7}/{16})^{\;\text "part "\;}=\;{7}/{2} {cm}

∴

Total length of Pencil

=\;{7}/{2} × \;{16}/{7}=8 {cm}

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