Subject: General Aptitude · Chapter: Area · Exam: · Marks: · Difficulty:
If the area of a square increases by 69\%, then the side of the square increases by
(a)13\%
(b)30\%
(c)39\%
(d)69\%
Answer
Answer (as printed): B
Explanation
Let original area $=100 \mathrm{cm}^{2}$. Then, new area $=169 \mathrm{cm}^{2}$. ⇒ Original side = 10 cm, New side $=13 \mathrm{cm}$. Increase on $10 \mathrm{cm}=3 \mathrm{cm}$. Increase\% $=\left(\frac{3}{10} \times 100\right) \%=30 \%$.