a contractor undertook to do a piece of work in 15 days . he employed certain number of laboures but 5 of them were absent from the very first day and the rest could finish the work in only 20 days . find the number of men originally employed ?
"let the number of men originally employed be x . 15 x = 20 ( x â € “ 5 ) or x = 20 answer b"
divide(multiply(20, 5), subtract(20, 15))