In a mixture there are three pounds of cement mix for each pound of gravel. If the mixture contains a total of 220 pounds of these two ingredients , how many pounds of gravel are there?

3 and 1 make ? That gives you a proportion of cement to total and gravel to total. Basic math after that, sorry, we don't do your work. OOH, I just read your other post I WANT ANSWERS!! That won't get you too far here.