Triangles ABD and BCD are similar, because they are both right and share a common angle, and thus all three angles are equal.
This means that we can set the proportion

Plug the numbers and we have

Solve for
:

1/5 = 0.2 = 20%
100% - 20% - 10% = 70%
He left 70%
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Answer:
-2 = n
Step-by-step explanation:
-3 + 4n = 4n + 3 + 3n
-3 + 4n = 7n + 3 [Combine like-terms]
-7n -7n
________________
-3 - 3n = 3
+3 +3
________________
-3n = 6
n = -2
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We have that 3 pencils cost $0.35, and 2 dozen pencils are 24 pencils, then we divide by 3 to know how many 3-pencils combo we can get:

therefore, 2 dozen pencils would cost $2.8