30 square stone slabs of equal size were needed to cover a floor area of 67.5 sq.m. Find the length of each stone slab?  Choose the correct answer:  A) 150 cm  B) 767 cm  C) 88 cm  D) 666 cm  E) 776 cm

Rationale: "area of each slab = 67.5 / 30 m 2 = 2.25 m 2 length of each slab √ 2.25 = 1.5 m = 150 cm"
Answer: A