How many jelly beans will fit in a 30 gallon trash can?
1. original guess
2. questions (at least 2)
3. assumption (at least 2)
4. final answer/comparison

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

just sum

10 + 10 = 20

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