Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: 2010 · Marks: · Difficulty:
If each edge of a cube is increased by 50%, find the percentage increase in its surface area.
Answer
Answer (as printed):
Explanation
Let original length of each edge = a. Then, original surface area = 6a2. 150 3a New edge = (150% of a) = a = . 100 2 2 3a 27 2 New surface area = 6 × = a . 2 2 15 2 1 Increase percent in surface area = a × 2 × 100 % = 125%. 2 6a VOLUME AND SURFACE AREAS 769
Explanation as extracted from the printed page; notation may be imperfect.