A group of men decided to do a job in 3 days. But since 30 men dropped out every day, the job completed at the end of the 5th day. How many men were there at the beginning?

Question: A group of men decided to do a job in 3 days. But since 30 men dropped out every day, the job completed at the end of the 5th day. How many men were there at the beginning?

solution:
ধরি,
শুরুতে লোক ছিলো = x

প্রশ্নমতে,
3x = x + (x - 30) + (x - 60) + (x - 90) + (x - 120)
3x = 5x - 300
2x = 300
x = 150

∴ শুরুতে ১৫০ জন লোক ছিল।