A labourer is engaged for 20 days on the condition that he will receive Rs 60 for each day, he works and he will be fined Rs 5 for each day, he is absent. If he receives Rs 745 in all for how many days he remained absent?
Let the number of absent days are 
Number of present days = 
Wage for one day work = Rs 60
Fine for absent day = Rs 5
According to the question:
Therefore number of absent days are 7 days
18