How many three-digit positive integers x are there with the property that x and 2x have only even digits? (One such number is x=420, since 2x=840 and each of x and 2x has only even digits.)
Answer Choices
A. 64
B. 18
C. 16
D. 125
E. 100
How many three-digit positive integers x are there with the property that x and 2x have only even digits? (One such number is x=420, since 2x=840 and each of x and 2x has only even digits.)
Answer Choices
A. 64
B. 18
C. 16
D. 125
E. 100