Answer:
5 students got both a pencil and a notebook
Step-by-step explanation:
What I did was to know which multiplication table I knew better and not do that one. So, I already have 9, <u>18</u>, 27, <u>36</u>, 45, <u>54</u>, 63, <u>72</u>, 81, <u>90</u>, 99
Then I matched it with the 6's.
6, 12, <u>18</u>, 24, 30, <u>36</u>, 42, 48, <u>54</u>, 60, 66, <u>72</u>, 78, 84, <u>90</u>, 96, 102
(This may not be the official method but I found this method the easiest)
So therefore your answer would be 5 students.