Problem 16 of 22num-016
Lena hikes mile to a waterfall, then mile more to a lookout. How many miles does she hike in all?
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Solution walkthrough1:29
- The total is . Thirds and fourths are different sizes, so they cannot be added yet.
- Cut both miles into twelfths: is the smallest number that both and divide.
- Count twelfths: and .
- Now the pieces match: mile, which is miles.
- Traps: adds tops and bottoms, skips rescaling the tops, multiplies.