The height of Tower A is 720 feet more than Tower B. The two towers have a combined height of 1,982 feet. What are the heights of each tower?

Okay so.

We have two basic equations

Tower A + B+720 A is 720ft taller than B.

Tower A+B = 1982 Combined height is 1982ft

Replace A with B+720 in 2nd equation and solve for B

B+720+B=1982 Combine like terms

2B+720=1982 Subtract 720 from both sides

2B=1262 Divide both sides by 2

B=1262/2

B = 631ft

We know that A=B+720 so you simply need to do that addition to have the height of both towers.