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? Think carefully first, then make a decision:
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. So, the answer is 24.