360 বিঘা জমি 20 দিনে চাষ করতে 4 টি ট্রাক্টর লাগে। 1800 বিঘা জমি 10 দিনে চাষ করতে হলে কটি ট্রাক্টর লাগবে?
Answers
Given : It takes 4 tractors to cultivate 360 bighas of land in 20 days.
To Find : How many tractors will it take to cultivate 1800 bighas of land in 10 days
Solution:
It takes 4 tractors to cultivate 360 bighas of land in 20 days.
=> 4 * 20 = 80 tractors days = 360 bighas
=> 1 tractors day = 360/80 bighas
=> 1 tractors day = 9/2 bighas
Let say n tractors to cultivate 1800 bighas of land in 10 days
=> n * 10 = 10n tractors days
= 10n * (9/2) bighas
= 45n bighas
45n bighas = 1800 bighas
=> n = 1800/45 = 40
Hence 40 tractors to cultivate 1800 bighas of land in 10 days
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