A 3-pack of jump ropes costs $6.90. What is the unit price?

690 du dude are you smart

$2.30 for each jump rope.

Step-by-step explanation:

6.90 / 3 = 2.3

4/52*20/51

9/38

Step-by-step explanation:

For the first one

4/52*20/51

4/52 - 4 kings out of 52 cards and 5*4=20 numbered cards (1, 3, 5, 7, 9) out of 51 cards (one taken at first step)

For the second one

10/20*9/19= 90/380=9/38

10 green out of 20 marbles, then 9 green out of 19 marbles (one green taken at first step)