The answer is 9 by the way. Draw a circle with sixty slices, shade in 15% or 9 slices.
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Sum of the interior angles of any triangle is 180° .
Thus ;


Subtract sides 138°


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The answer appears to be 2 dollars for 3 pounds because the pattern seems like 2,4,6
You would need about 34 2/3 tablespoons of butter. Convert the fraction into an improper fraction, so 8/3. Then multiply that by 13 (you and your brother are included in the 15 people I suppose) and you get 104/3. Simplify that to get a mixed number and you have 34 2/3.