out 90 civil servant , 65vwere working in the office, 50 were working in the field and 35 were working in both yhe premises. find , how many civil servant were absent?

we have,

office - 65

field - 50

but we know 35 worked both office and field

so those who worked

office only - ( 65 - 35 ) = 30

field only - (50 - 35) = 15

worked both - 35

total people working on site = 30 + 15 + 35 = 80

total absent = 90 - 80 = 10 civil servants

Step-by-step explanation: