a+b+c+d=180
a=d/4-->b/2=d/4-->d=2b
c=a-20-->c=b/2-20
2a=b-->a=b/2
b/2+b+b/2+2b=200
4b=200
b=50
Angles on a Line
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truplayer256
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grockit_jake
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a = (d/4)
c = a - 20
and 2a = b
a + b +c + d = 180
Now just replace b, c, d in terms of a and solve.
c = a - 20
and 2a = b
a + b +c + d = 180
Now just replace b, c, d in terms of a and solve.
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hansoo
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Nice job guys! The official answer is E.
Here's a video explanation: GMAT video
And here's a text explanation:
Here's a video explanation: GMAT video
And here's a text explanation:
