Question

This morning, a convenience store had 21 granola bars in stock. The store sold 6 granola bars throughout the day. If the store will receive a shipment of 42 granola bars tomorrow, how many granola bars will it have in stock?

Answer 1

Had 21 bars. Sold 6.
Left (21-6)
Will receive 42 granola bars (21-6+42)
21-6+42=57 granola bars
57 granola bars, a store will have in stock.