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Define a variable and then write and solve an equation for the problem below. Remember that you can use the -D Process (described in the Lesson 1.1.3 Math Notes box) to help you get started. State your solution in a sentence.

Todd is years older than Jamal. The sum of their ages is . How old are Todd and Jamal?  

Rewrite the word problem as an equation or system of equations.

Have Jamal's age be . Write Todd's age in terms of .

1 row of 2 columns, labeled from left to right, as follows: Jamal's age, x, Todd's age, x + 10.

Third column added, labeled, x + (x+10) = 64.

Fourth column added, labeled, 64?

Make a guess for Jamal's age. Was your answer too high or too low? Try again using a larger or smaller number as appropriate.