Justin weighs 15 pounds less than Greg weighs. Half of Greg's weight is 75 pounds less than Justin's weight. How much does each of them weigh?

Justin=JGreg=G

Information we have:J+15=GG/2=J-75

Since J+15=GJ = G-15We now replace J in the second equationG/2 = (G-15) - 75G/2=G-90G = (G-90) * 2G=2G-180G-2G=-180-G=-180G=180

Greg = 180 poundsJustin = 165 pounds