He will need 2 pencils to fill 20 desks. Here's how I found the answer:
20÷10=2
2×10=20. So the answer is 2.
Your answer would be 105. Hope this helps!
Basically, we need to find the lowest common multiple of 6 and 9....and that would be 18.
so 18 minutes from 4 p.m. is 4:18 p.m. <===
The answer is the last option.