# SOLUTION: thirty buliding operatives employed on a construction site work a 37 hour week. if the 30 operatives comprise tradesmen earning £4.75/ hour and labourers earning £4.25/ hour, how

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 Click here to see ALL problems on Matrices-and-determiminant Question 557023: thirty buliding operatives employed on a construction site work a 37 hour week. if the 30 operatives comprise tradesmen earning £4.75/ hour and labourers earning £4.25/ hour, how many tradesmen and how many labourers are there if the weekly bill is £5124.50. using matrices?Answer by KMST(1868)   (Show Source): You can put this solution on YOUR website!Let be the number of tradesmen and be the number of laborers. and ---> (multiplying both sides times 4 to get rid of decimals) = Now you have your matrices: = = , and = The equation with matrices is Now you have to find the inverse matrix and calculate = Whichever way you were taught to calculate it = and = = = = So the number of tradesmen is , and the number of laborers is .