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If \(a\) is a positive integer and the tens digit of \(10a\) is 3, which of the following is the units digit of \(a ?\)

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by Gmat_mission » Sun Jun 14, 2020 2:37 pm

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B

C

D

E

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Difficulty—

If \(a\) is a positive integer and the tens digit of \(10a\) is 3, which of the following is the units digit of \(a ?\)

a. 1

b. 3

c. 5

d. 7

e. 9

[spoiler]OA=B[/spoiler]

Source: Princeton Review
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Re: If \(a\) is a positive integer and the tens digit of \(10a\) is 3, which of the following is the units digit of \(a

by Scott@TargetTestPrep » Sat Jun 20, 2020 2:06 pm
Gmat_mission wrote: ↑
Sun Jun 14, 2020 2:37 pm
 If \(a\) is a positive integer and the tens digit of \(10a\) is 3, which of the following is the units digit of \(a ?\)

a. 1

b. 3

c. 5

d. 7

e. 9

[spoiler]OA=B[/spoiler]

Solution:

The tens digits of 10a is the units digit of a (since a is multiplied by 10). So the units digit of a is 3.

Answer: B

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