Eduardo had some candy to give to his four children. he first took four pieces for himself and then evenly divided the rest among his children. each child received five pieces. with how many pieces did he start?

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.