Greg and Jane left a 15% tip after dinner. The amount of the tip was $9. Greg's dinner cost $24. Which equation can you use to find x, the cost of Jane's dinner?

Let x be the cost of Jane's meal as stated in the question.

Greg's dinner cost $24. Total cost of dinner = (x + 24)

Tip 15% of dinner cost. Tip was $9.

15% of (x + 24) = 9

(15/100) * (x + 24) = 9

0.15 * (x + 24) = 9. That's the equation. Question answered.

But let's just go ahead and find x for the fun of it.

0.15 * (x + 24) = 9.

(x + 24) = 9/0.15

(x + 24) = 60

x = 60 - 24

x = 36

x, which, Jane's dinner cost = $36.