Source: Official Guide for GMAT Review 2016 Problem Solving; #33

1

In the figure above, what is the ratio

In the figure above, what is the ratio of the measure of angle B to the measure of angle A?

2 Explanations

1

Mohd Halim Bin Hisyam

In the question they did not specify, the triangle is a right triangle, where the angles within a right angle triangles are 90, 60, 30 degrees respectively. As such, this assumption will result to a wrong answer.

Jul 8, 2018 • Comment

David Recine, Magoosh Tutor

Absolutely correct, Mohd. :) The real solution is to solve for y, as seen in Jeffrey Braganza's comment on this page.

Jul 15, 2018 • Reply

1

Jeffrey Braganza

Sum of all internal angles of a triangle must be 180
(this is a 90 deg triangle)
Hence, Y + (Y + 10) + 90 = 180
Y = 40
angle B = Y = 40
angle A = (Y + 10) = 50

angle B/ angle A = 40/50 = 4/5

Dec 31, 2015 • Comment

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Official Guide for GMAT Review 2016

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 5.3 Problem Solving

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