a roofer charges $25 per hour for himself and $15 per hour for his assistant. On a recent job the assistant worked 2 hours less than the roofer and the tot charge for labour was $290. Let r be the number of hours that the roofer worked. Which of the following equation can be used to find r.

Question

a roofer charges $25 per hour for himself and $15 per hour for his assistant. On a recent job the assistant worked 2 hours less than the roofer and the tot charge for labour was $290. Let r  be the number of hours that the roofer worked. Which of the following equation can be used to find r.
25r+15r=290
25(r+2)+15r=290
25(r+15(r+2)=290
25(r-2)+15r=290
25r+15(r-2)=290

I put 25(r-2)+15r=290
am I correct

Steve · Answer

25r + 15(r-2) = 290 You got the rates reversed. The assistant at $15 worked 2 hours less than the roofer (at $25).