2400 Bighas of land of Cooperative Society can be cultivated by 25 farmers in 36 days. It was seen that half of the land of the Society could cultivate in 30 days after purchasing a tractor. Let’s work out the power of a tractor equivalent to the number of farmers using the method of Rule of Three.

A company has got the work of unloading goods from a ship in 10 days. 280 heads of people have been employed for this purpose After 3 days it is seen that th of the work has been completed. Let’s work out using the method of the Rule of Three how many heads of people are to be engaged to complete the work in time.

A power-loom is times more powerful than a hand-loom. 12 hand-looms weave 1080 meters length of cloth in 18 days. Let’s work out by the Rule of Three how many power-looms will be required to weave 2700 meters length of cloth in 15 days.

A ship takes 25 days to sail from Kolkata to Cochin. The ship started with 36 sailors for each of which 850 gm of food was allotted. But the ship rescued 15 sailors from anothersinking-ship after 13 days of journey and the ship reached Cochin in 10 days increasing the speed. Let’s work out using the method of the Rule of Three what will be the quantity of food to be consumed by of each sailor to each Cochin safely and the entire storage of food would be consumed by this time.

36 heads of people of a certain village can construct 12- metres of raod working 6 hours daily in 12 days. Another 6 heads of people are involved in this work and the duration of work of each day is increased by 2 hours. Let’s work out using the method of the Rule of Three the length of road to be constructed in 9 days.