Sammy can eat 15 pickle slices. His twin sister Tammy can eat twice as much as Sammy. Their older brother Ron eats 20% fewer pickles slices than Tammy. How many pickle slices does Ron eat?
A step-by-step solution is:
24
Tammy can eat twice as many pickle slices as Sammy who eats 15 so Tammy can eat 15 * 2 = 30 pickle slices.

Ron eats 20% fewer pickle slices than Tammy who eats 30 pickle slices so that's.

20 * 30 = 6 fewer slices than Tammy.

Tammy eats 30 slices and Ron eats 6 less, then Ron eats 30 - 6 = 24 pickle slices.

.

Therefore, the answer is 24