50 square stone slabs of equal size were needed to cover a floor area of 72 sq.m. Find the length of each stone slab.

A. 110 cm

B. 115 cm

C. 120 cm

D. 125 cm

Correct Answer :

C. 120 cm

Area of each slab = $\frac{72}{50}{m}^{2}=1.44{m}^{2}\phantom{\rule{0ex}{0ex}}Lengthofeachslab=\sqrt{1.44}\phantom{\rule{0ex}{0ex}}=1.2m=120cm\phantom{\rule{0ex}{0ex}}$