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If ​ x ​ and ​ y ​ are the tens digit and the units digi

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If ​ x ​ and ​ y ​ are the tens digit and the units digi [#permalink] New post 24 Jan 2017, 02:34
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Question Stats:

88% (00:38) correct 11% (01:07) wrong based on 27 sessions


If x and y are the tens digit and the units digit, respectively, of the product 725,278 x 67,066, what is the value of x + y ?


A) 12
B) 10
C) 8
D) 6
E) 4
[Reveal] Spoiler: OA

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Re: If ​ x ​ and ​ y ​ are the tens digit and the units digi [#permalink] New post 26 Jan 2017, 18:31
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Explanation

The GRE calculator only displays eight digits, so you would get an “Error” message if you tried to solve this multiplication problem with the GRE calculator during the test. While you can certainly multiply 725,278 by 67,066 by hand, you would waste valuable time (not to mention open yourself up to careless mistakes) because you really only need to multiply the last two digits of each number:


\(725278 \times 67066\)\(78 \times 66\)
\(48641494348\)\(5148\)


And \(x = 4\), \(y = 8\)

Now find the sum of x + y: 4 + 8 = 12. Hence option A is correct.
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Re: If ​ x ​ and ​ y ​ are the tens digit and the units digi [#permalink] New post 10 Nov 2018, 01:19
multiply the last 2 digits of both numbers instead of wasting time solving the entire multiplication, the product will give a 4 digit number which will give the units and 10s digit as required
Re: If ​ x ​ and ​ y ​ are the tens digit and the units digi   [#permalink] 10 Nov 2018, 01:19
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If ​ x ​ and ​ y ​ are the tens digit and the units digi

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