JoAnn Brandt decided to use an expensive, but effective, herbicide to kill weeds and brush...

JoAnn Brandt decided to use an expensive, but effective, herbicide to kill weeds and brush on a client’s land. For one part of the land, she needed  quarts of herbicide; for a second part, she needed  quarts; and for the third part, she needed  quarts. In total, how many quarts of herbicide did JoAnn need for this client?_____