[GMAT math practice question] 2.19
What is the value of \(\sqrt{360x}\) ?
1) x is a 2 digit integer.
2) \(\sqrt{360x}\) is an integer.
What is the value of
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- Max@Math Revolution
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Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.
Visit https://www.mathrevolution.com/gmat/lesson for details.
Since we have 1 variable (x) and 0 equations, D is most likely the answer. So, we should consider each condition on its own first.
Condition 1)
Since we don’t have a unique value from condition 1), it does not yield a unique solution, and it is not sufficient.
Condition 2)
10 and 40 are possible values of x, since \(\sqrt{360\cdot10}=\sqrt{3600}=60\) and \(\sqrt{360\cdot40}=\sqrt{14400}=120\)
Since condition 2) does not yield a unique solution, it is not sufficient.
Conditions 1) & 2)
10 and 40 are possible values of x satisfying both conditions as well.
Since both conditions together do not yield a unique solution, they are not sufficient.
Therefore, E is the answer.
Answer: E
If the original condition includes “1 variable”, or “2 variables and 1 equation”, or “3 variables and 2 equations” etc., one more equation is required to answer the question. If each of conditions 1) and 2) provide an additional equation, there is a 59% chance that D is the answer, a 38% chance that A or B is the answer, and a 3% chance that the answer is C or E. Thus, answer D (conditions 1) and 2), when applied separately, are sufficient to answer the question) is most likely, but there may be cases where the answer is A, B, C, or E.
Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.
Visit https://www.mathrevolution.com/gmat/lesson for details.
Since we have 1 variable (x) and 0 equations, D is most likely the answer. So, we should consider each condition on its own first.
Condition 1)
Since we don’t have a unique value from condition 1), it does not yield a unique solution, and it is not sufficient.
Condition 2)
10 and 40 are possible values of x, since \(\sqrt{360\cdot10}=\sqrt{3600}=60\) and \(\sqrt{360\cdot40}=\sqrt{14400}=120\)
Since condition 2) does not yield a unique solution, it is not sufficient.
Conditions 1) & 2)
10 and 40 are possible values of x satisfying both conditions as well.
Since both conditions together do not yield a unique solution, they are not sufficient.
Therefore, E is the answer.
Answer: E
If the original condition includes “1 variable”, or “2 variables and 1 equation”, or “3 variables and 2 equations” etc., one more equation is required to answer the question. If each of conditions 1) and 2) provide an additional equation, there is a 59% chance that D is the answer, a 38% chance that A or B is the answer, and a 3% chance that the answer is C or E. Thus, answer D (conditions 1) and 2), when applied separately, are sufficient to answer the question) is most likely, but there may be cases where the answer is A, B, C, or E.
Math Revolution
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Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]