RRB Group D 10-Oct-2018 Shift 2 Solved Paper

Question : 6 of 100

Marks: +1, -0

If the dimension of a square are increased by

10 \%,

the area of the square increases by:

Solution:

Let the original side be a units

∴

area

={a}^{2}

sq. units
Dimension increased by

10 \%,

so new side

=a+0.1 {a}=1.1 {a}

∴

area

=(1.1 {a})^{2}=1.21 {a}^{2} {\sq} .

units
Thus, area increased by

={1.21-1}/{1} × 100=21 \%

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