Question

If the Acme building is 140 feet taller than the Swartz building, and the sum of the heights of the two buildings is 560 feet, how tall is the Acme building?

Answer 1

y=x+140 x+y=560 x+y=x+x+140...=2x+140...=560 2x=560-140....=420 x=210 y=210+140=350

Answer 2

A=S+140 where A is the height of the Acme building and S the height of the Swartz, S+140+S=560, their combined heights. So 2S+140=560; 2S=560-140=420; S=420/2=210 feet and A, the height of Acme, is 210+140=350 feet.