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If the tens digit of positive integers x, y are 6, how many

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by Max@Math Revolution » Mon Mar 14, 2016 5:08 pm
If the tens digit of positive integers x, y are 6, how many values of the tens digit of 2(x+y) can be there?

A. 2
B. 3
C. 4
D. 5
E. 6


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by Max@Math Revolution » Thu Mar 17, 2016 5:21 pm
If the tens digit of positive integers x, y are 6, how many values of the tens digit of 2(x+y) can be there?

A. 2
B. 3
C. 4
D. 5
E. 6


-> If X=y=60, 2(x+y)=240 is derived. If x=y=69, 2(x+y)=276 is derived, which makes 4,5,6,7 possible for the tens digit. Therefore, the answer is C.
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