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1. A rectangle is 14 cm long and 10 cm wide . If the length is reduced by x cms and its width is increased also by x cms so as to make it a square, then its area changes by :
- A. 4
- B. 4
- C. 4
- D. 4
Answer: Option A
Explanation:
Area = 14 × 10 = 140 sq.cm
New length = ( 14 - x)
New width = ( 10 + x)
14 - x = 10 + x
2x = 4
x = 2
New Area = ( 14 - 2) × ( 10 + 2) = 144
change is area = ( 144 - 140) sq.cm = 4 sq.cm
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