Discussion
The perimeter at a rectangle is 144 cm. It one of the two adjacent sides is 20 cm longer than other, then the lengths of the sides are
Answer: D
The sides are 26 cm, 46 cm.
Half the perimeter, 72 cm, is the sum of two adjacent sides. If the shorter side is x, the other is x + 20:
\[ \begin{aligned} x + (x + 20) &= 72 \\ 2x &= 52,\ x = 26 \end{aligned} \]
So the sides are 26 cm and 46 cm. Check: \(2(26 + 46) = 144\). In each of the other options either the two sides do not differ by 20 cm or they do not add up to 72 cm.
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