(NOTE: Figure not drawn to scale)

What is the measure of angle B?

(1) y = 243 – 22x

(2) y = 261 – 24x


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Using statement 1 ,
x^2-16x+63=0 , X=7 or 9 ... angle B will depend value on X. so this statement not enough.

Using statement 2 ,
x^2-18x+81=0 , so X=9 ...This is enogh to know value of angle B.

So B is answer
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VERITAS PREP OFFICIAL SOLUTION:

The angles of any triangle add up to 180°, so we can write x^2+6x+y=180. However, we cannot figure out angle B, which measures 6x°, until we turn to the additional premises.

Statement (1) gives y=243–22x. Substituting this equation into our original equation gives x^2+6x+243–22x=180. Standardizing and simplifying, this reduces to x^2–16x+63=0. This quadratic gives two possible values of x. It isn’t really necessary to proceed further, but we’ll point out that it factors as (x–7)(x–9)=0 and x=7 or 9. Angle B could measure either 42° or 54°, so statement (1) standing alone is insufficient.

Statement (2) gives y=261–24x. Substituting this equation into our original equation gives x^2+6x+261–24x=180. Standardizing and simplifying, this reduces to x^2–18x+81=0. Unlike the quadratic from statement (1), however, this quadratic is a common algebraic equation – a perfect square. It factors as (x–9)^2=0, and it has only one solution: x=9. In turn, angle B measures 54°. So statement (2) standing alone is sufficient.

Answer: B.
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Resources:
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
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