Question

1. 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?

(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.
I think I know but I just don't know how I should write my equation

Answer 1

Kim's age = 2x Sister's Age
Kim's age + Sister = 36

We can write this equation:
2s + s = 36
3s = 36
3s/3 = 36/3
s = 12

Kim is 12, and her sister is 36.