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A workman is paid rs 150 for each day he works and is fined rs50 for each day he is absent. In a month of 30 days he earned rs 2100.For how many days was

No of days he came let be x no of days absent be y x+y=30 150x-50y=2100 3x-y=42 equation 1 x+y=30 equation 2 adding 1 and 2 4x=72 x=18 y=12 no of days he was absent is 12 days

Let us say he was present for p days and absent for a days we know a+p=30 we also know 150*a-50*p=2100*1 we also know 3*p-a=42 a+p=30 to solve it we add them 4*x=72 x=72/4=18 18+a=30 a=30-18 a=12 therefore he did not come to work for a total of 12 days.