A worker is hired for 7 days, Each day, he is paid 10 taka more then what he is paid for the previous day of work. The total amount he was paid in the first 4 days of work equaled the total amount he was paid in the last 3 days. What was his starting pay?

Correct Answer: 90
ধরি, starting pay ছিল x টাকা2nd day (x + 10)3rd day (x + 20)4th day (x + 30)5th day (x + 40)6th day (x + 50)7th day (x + 60) টাকা⸫ x + x + 10 + x + 20 + x + 30 = x + 40x + 50 + x + 604x + 60 = 3x + 150⸫ x = 90