The length of a rectangle is 18 cm and its breadth is 10 cm. When the length is increased to 25 cm, what will be the breadth of the rectangle if the area remains the same?

A. 7 cm

B. 7.1 cm

C. 7.2 cm

D. 7.3 cm

Correct Answer :

C. 7.2 cm

Let the breadth be B. Then, $25\times B=18\times 10\iff B=\left(\frac{18\times 10}{15}\right)cm=7.2cm$$25\times B=18\times 10\iff B=\left(\frac{18\times 10}{15}\right)cm=7.2cm$