Question

The length and breadth of a rectangle are $20$ cm and $10$ cm. The length of another rectangle is $40$ cm but the breadth is unknown. It is known that the ratio of length to the breadth of both the rectangles is the same. What is the measure of the breadth of the second rectangle?

• A. 10 cm
• B. 20 cm
• C. 30 cm
• D. 15 cm

Answer 1

The correct option is B 20 cm

Ratio of the length to the breadth of the first rectangle $=20:10$ $\Rightarrow 2:1$

Let the breadth of the second rectangle be $x$ cm.
It is given,
$40:x=2:1$
$\Rightarrow$ $\frac{40}{x}=\frac{2}{1}$

$\Rightarrow 2x=40$
$\Rightarrow x=20$ cm