Area - Quantitative Aptitude (MCQ) questions for Q. 712
Q. If the length is increased by 25%, by what percent the width of a rectangle should be decreased so as to keep the area same.- Published on 06 Jul 15a. 25%
b. 20%
c. 30%
d. 10%
ANSWER: 20%
Let the original length be l and the width be b
Therefore, the area = l*b
Now, as the length is increased by 25%, the new length is (1.25*l) and let the new width be x.
As the area is same, 1.25*l*x = l*b
x = b/1.25 = 0.8b
Therefore, the width is to be decreased by 20%.
