Question 12
A display shelf initially holds some new products. At the end of day 1, 50% of the products are sold and then 20 are added. At the end of day 2, 50% of the products then on the shelf are sold and then 40 are added. At the end of day 3, 50% of the products then on the shelf are sold and then 80 are added. The shelf now holds the same number of products as initially. How many products were on the shelf initially?
