Marvin washes 10 1/2 crates in 3/4 hours. At this rate how many crates can he wash in one hour?

Please help us due tomorrow 3/3/2020!!!

To work this one out, you want to divide 10 1/2 by 3/4 right? So to do that, you want to change 10 1/2 to an improper fraction (21/2) and multiply it by 3/4’s reciprocal (4/3) and use cancellation to get the answer 14. Attached is an example of how to work it out on paper.

The probability of drawing both without replacing either is :

14/41 * 12/40 = 7/41 * 3/5 = 21/205

The probability of drawing both WITH replacement is:
14/41 * 12/41 = 168/ 1681

there you have it :D