A carpenter had a board which measured 3 m × 2 m. She cut out a rectangular piece of 250 cm × 90 cm. What is the ratio of the area of cut out piece and the remaining piece?
3 : 5
Whole board area = 3 m × 2 m = 6 m². Cut-out = 2.5 m × 0.9 m = 2.25 m². Remaining = 6 − 2.25 = 3.75 m². Ratio = 2.25 : 3.75 = (225 : 375) = 3 : 5.