How many positive even integers less than 100 contain digits 7 or 9?
Select the correct option
A) 16
B) 17
C) 18
D) 19
E) 10
Two digit numbers:   7 at tens place: 70,72,74,76,78   9 at tens place: 90,92,94,96,98   If 7 and 9 is at units place, the number cant be even   Total:5+5= 
<gadget id="calculator">5+5</gadget>
<output>10</output>
10   Answer 10
<result>E</result>
How many positive even integers less than 100 contain digits 7 or 9?