This task aligns to 3.NBT.3. This is remixable if you are able to add samples of student work. 

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Elana makes $30 every time she helps her aunt watch her baby on a Saturday. Elana wants to purchase a new bike with the money she earns. The new bike is $240.

How many weeks will she have to help her aunt to earn enough money to purchase a new bike?

Use words, pictures, or equations to show how she can figure out how long it will take.