Jim weighs 30 pounds less than Tom, and together they weigh 210 pounds. Let #n# Tom's weight in pounds. What would be the equation that expresses the total of Jim's and Tom's weights?
Jim and Tom's total weight is expressed by
and solving this equation tells us that Tom weighs 120 pounds, and Jim weighs 90 pounds.
So an equation for their total weight would be
We could then continue to solve for
Tom weighs 120 pounds.
Jim's weight is then
Jim weighs 90 pounds.