todd has a bag of 150 pieces of candy. every weekday he eats 2 pieces and 3 pieces on weekends until

todd has a bag of 150 pieces of candy. every weekday he eats 2 pieces and 3 pieces on weekends until he has no more left.

So each week, he eats 2*5 + 3*2 = 10 + 6 = 16 pieces
16 per week * 9 weeks = 144 pieces

150 - 144 = 6 pieces left
3 weekdays * 2 pieces per weekday = 6.

So, Todd ate all the candy in 9 weeks, 3 days.