Question 215 Data Sufficiency 2020 GMAT Quantitative Review
Question 215 Data Sufficiency 2020 GMAT Quantitative Review
Video explanation [PQID: DS03602.01]: If three straight lines intersect at a point as shown…
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Mathieusays
I was tricked at statement 2) because I thought I could have one equation = to 360 with only one unknown x, i.e. 2y + 2x + 120 = 360 with y expressed in terms of x like this: (180 – x – 60). Why does this not work?
Both of these equations are identical, meaning $2y+2x+120=180$ can be rearranged to give $y= 180-x-60$, but that still does not give us a unique value for the angle $x$.
I was tricked at statement 2) because I thought I could have one equation = to 360 with only one unknown x, i.e. 2y + 2x + 120 = 360 with y expressed in terms of x like this: (180 – x – 60). Why does this not work?
Both of these equations are identical, meaning $2y+2x+120=180$ can be rearranged to give $y= 180-x-60$, but that still does not give us a unique value for the angle $x$.