Post your question in the Comment section below, and a GRE expert will answer it as fast as humanly possible.
- Video Course
- Video Course Overview
- General GRE Info and Strategies - 7 videos (free)
- Quantitative Comparison - 7 videos (free)
- Arithmetic - 42 videos
- Powers and Roots - 43 videos
- Algebra and Equation Solving - 78 videos
- Word Problems - 54 videos
- Geometry - 48 videos
- Integer Properties - 34 videos
- Statistics - 28 videos
- Counting - 27 videos
- Probability - 25 videos
- Data Interpretation - 24 videos
- Analytical Writing - 9 videos (free)
- Sentence Equivalence - 39 videos (free)
- Text Completion - 51 videos
- Reading Comprehension - 16 videos
- Study Guide
- Philosophy
- Office Hours
- Extras
- Prices
Comment on Triangle with Variable Angles
The sum of exterior angles of
Be careful. (6x - 30) is not
Be careful. (6x - 30) is not an exterior angle.
I started plugging in numbers
4(15) + 70 + x = 180
60 + 70 + x = 180
130 + x = 180
x = 50
130 + 50 = 180 which happened to be 15, the first number I chose.
It certainly LOOKS like a
It certainly LOOKS like a valid strategy (since you arrived at the correct answer). However, I'm not 100% I understand what you did.
If you're testing the answer choices and started with answer choice C (15), then you are testing whether or not x = 15. However, as part of your solution, you say that x = 50 (not x = 15), so I'm not sure what's happening there.
Can you tell me a bit more about your solution?
Cheers,
Brent
Writing 180-4×+70=250-4x and
We use brackets around entire
We use brackets around entire entities/values.
For example, one angle measures 4x + 70.
That is, (4x + 70) represents a SINGLE measurement.
So, the angle on the same line will = 180 - (that entire measurement.)
= 180 - (4x + 70)
Does that help?
Cheers,
Brent