Mathematics
NULL
Medium
Question
A rectangle has length 15 cm and area 150 cm². Its area is increased to 1 1/3 times the original area by increasing only its length. Its new perimeter is _________?
A
50 cm
B
60 cm
✓ Official correct answer
C
70 cm
D
80 cm
Community credibility
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A
50 cm
No member explanations yet for this option.
B
60 cm
No member explanations yet for this option.
C
70 cm
No member explanations yet for this option.
D
80 cm
No member explanations yet for this option.
Explanation
Breadth = 150/15 = 10 cm. New area = 200 cm² ⇒ new length = 20 cm. Perimeter = 2(20 + 10) = 60 cm.