When david took his dog rocky to the vet in december, rocky wighed 29 pounds 9 ounces. when he took rocky back to the vet in march rocky wighed 34 pounds 4 ounces. how much wight did rocky gain?

34 pounds 4 ounces - 29 pounds 9 ounces = 5 pounds 4 ounces - 9 ounces  

1pound =16 ounces

 5 pounds 4 ounces = 4 pounds+16 ounces +4 ounces = 4 pounds 20 ounces

4 pounds 20 ounces - 9 ounces  = 4 pounds 11 ounces

Answer : 4 pounds 11 ounces

A= b/2 because u simplying both sides of equation