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In the addition problem above, the number \(*\) must be?

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Source: — Problem Solving |

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Re: In the addition problem above, the number \(*\) must be?

by Brent@GMATPrepNow » Fri Apr 08, 2022 5:34 am
Gmat_mission wrote: ↑
Thu Aug 20, 2020 9:26 am
 question.JPG

In the addition problem above, the number \(*\) must be?

(A) 5
(B) 6
(C) 7
(D) 8
(E) 9

Answer: B

Source: Official Guide
STRATEGY: Upon reading any GMAT Problem Solving question, we should always ask, Can I use the answer choices to my advantage?
In this case, we can easily replace each * with each answer choice until we find the one that creates the correct addition.
Now let's give ourselves up to 20 seconds to identify a faster approach.
In this case, we can also assign variables to the missing digits, but I can already see that testing the values will be super fast.
So, let's go with that...

When we replace each * with 5, the addition doesn't work.
When we replace each * with 6, the addition works!

Image

Answer: B
Brent Hanneson - Creator of GMATPrepNow.com
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