The ratio of height to number of dishes is 15 inches to 10 dishes. How high will a stack of 30 dishes be?
We can set up a proportion to solve this problem. Let x be the height of the stack of 30 dishes. We have the ratio:
15 inches/10 dishes = x inches/30 dishes
Cross multiplying, we get:
10*x = 15*30
10x = 450
x = 450/10
x = 45
Therefore, a stack of 30 dishes will be 45 inches high.