RRB Assistant Loco Pilot and Technician Model Paper 9 with solutions

Question : 22 of 100

Marks: +1, -0

If the length of a rectangle is increased by 10% and its breadth is decreased by 10%, the change in its area will be

Solution:

(b) Required change in area
trick = $-x^2/100$
Negative sign shows a decrease.
= 10 – 10 –

{10×10}/100

= –1%
or 1% decreasing

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