Calculate the area of a rectangle 25 metres 5 decimetres long and 15 metres 4 decimetres 6 centimetres wide.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 394.23 square metres
First bring both sides to one unit, metres (1 dm = 0.1 m, 1 cm = 0.01 m), then multiply length by breadth.
Length \(=25\,\mathrm{m}+0.5\,\mathrm{m}=25.5\,\mathrm{m}\)
Breadth \(=15\,\mathrm{m}+0.4\,\mathrm{m}+0.06\,\mathrm{m}=15.46\,\mathrm{m}\)
Area \(=25.5\times15.46=394.23\,\mathrm{m}^2\)