SOLUTION: for how many integers 1 to 100 are tens digit twice the unit digit? a)2 b)3 c)4 d)5 e)6

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Question 693263: for how many integers 1 to 100 are tens digit twice the unit digit?
a)2
b)3
c)4
d)5
e)6
Answer by Edwin McCravy(20064) About Me  (Show Source):
You can put this solution on YOUR website!
In the number 21, the tens digit 2 is twice the units digit 1.
In the number 42, the tens digit 4 is twice the units digit 2.
In the number 63, the tens digit 6 is twice the units digit 3.
In the number 84, the tens digit 8 is twice the units digit 4.
Gosh that was really hard, wasn't it? Can you count them?