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Equation practice with angles

Problem

The angle measurements in the diagram are represented by the following expressions.
A=5x15 B=2x+21
Two parallel lines with a third line intersecting each line. Where the third line crosses the left most parallel line, the bottom, left angle measure has a curved blue line and is labeled A. Where the third line crosses the right most parallel line, the top, right most angle measure has a curved green line and is labeled B.
Solve for x and then find the measure of B:
B=
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
Stuck?
Stuck?