algebra word problem

Question

building a is 302 meters taller than building b. if the height of building a is subtracted from twice the height of building b, the result is 193 meters. how tall is the skyscraper?

Answer 1

a= 302 +b

2b -a = 193

2b -302-b = 193

b = 193 +302 = 495 meters for building b

a = 495 +302 = 797 meters for building a