Let x be the unknown angle.
We know that x+50=120 because the value of an exterior angle of a triangle is equal to the sum of the other 2 interior angles.
x+50 = 120
Subtract both sides by 50
x = 70
The value of the unknown angle is 70 degrees.
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First box (under 1) is 7, next box (above 12.5) is 6.5 and the last box is 16
.45x+.55x=200
Combine like terms
1x=200
So x is 100
Or you can do 45%+55%=100%
And 100% of 200 is 200
All will apply except for (A, C, and E) because those lengths are less than 4/6. So (B, D and F) are the correct answers.
