2022 · Q90
Two rectangles are of same area equal to 480 square cm. They differ in lengths by 6 cm and breadths by 4 cm. What is the difference in their perimeters?
Elementary MathematicsQuadrilaterals and Polygons
- A2 cm
- B4 cm
- C6 cm
- D10 cm
Explanation
l₂b₂ = 480 and (l₂+6)(b₂−4) = 480 give 3b₂−2l₂ = 12, so b₂ = 20, l₂ = 24; the other rectangle is 30×16. Perimeters 92 and 88 differ by 4 cm. The keyed option is B.