Question

3. Kim's age is twice that of her sister. When you add Kim's age to her sister's age, you get 36. How old is each sister? (3 pts) a) Write an equation that represents the situation. Explain any variable used. b) Solve the equation from Part (a). Show your work. State your solution as a complete sentence.

Answer 1

Set kim's age to 2x. Set her sister's age to x. Now solve the equation:

2x+x=36
3x=36
x=12.

Remember, her sister's age was x, and x=12, so her sister is twelve. Kim's age is 12*2, so her age is 24.