1. The problem statement, all variables and given/known data If 15 workers can pave 18 driveways in 24 days, how many days would it take 40 workers to pave 22 driveways 2. Relevant equations Actually i dont know which equation should be used for 3 quantities. I know the eq for two quantities. Because we increasing labours so we would require less days Workers * days/ increased workers (i.e constant product eq) 3. The attempt at a solution I can find days using above eq: 15 * 24/40 = 9 days For 18 drive ways we need 9 days For 1 drive way , we would need 18/9 = 2 days For 22 driveways, we would need 11 days. Is there a simple method for solving the above problem. Zulfi.