Two beakers plus their contents have a mass of 180.4 grams. The total mass of the contents is 56.8 grams. Write and solve an equation to the mass of one beaker.
I don't know if I am right but I think this is the answer: If we write beaker with x and content with y then y=56.8/2=28.4 this is the content of one beaker so there are two beakers: 2x+28.4=180.4 2x=180.4-28.4 2x=152/2 x=76