hey user!
your answer is here..
ATQ,
Erika bought 20 pieces of candy. three-fourths of them were jelly beans and the rest was gum.
no. of pieces of jelly beans = 3/4 × 20
= 3 × 5
= 15
hence, 15 pieces of jelly beans Erika purchased.
therefore gum she bought = 20 - 15 = 5
she bought 5 pieces gums.
cheers!!