What is the value of x + y?
1) mx + ny + xn + ym = 10
2) m + n = 6
1) mx + ny + xn + ym = 10
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 |
Statement 1 is sufficient. |
 |
Statement 1 is insufficient. |
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Calculation is necessary. |
2) m + n = 6
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Statement 2 is sufficient. |
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Statement 2 is insufficient. |
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Calculation is necessary. |
1) mx + ny + xn + ym = 10
2) m + n = 6
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The statements together are
sufficient. |
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The statements together are
insufficient. |
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Calculation is necessary. |
Countinue
Most test-takers would have a tough time judging sufficiency here based
solely on a glance. However, the fact that the second statement is blatantly
insufficient — it doesn’t even mention the variables in the question
stem — should start you thinking that perhaps you can use that information
to decode the first statement. To do so, we’d need somehow to group m
and n together in the first equation so we could replace them with
their sum of 6. We can rearrange the equation as: mx + my
+ nx + ny = 10.
Countinue
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