On Monday afternoon the store sold 12 of its supply of bottl

On Monday afternoon, the store sold 1/2 of its supply of bottled water. On Tuesday, it sold 5 gallons of water. On Wednesday, it sold 12 gallons.

On Thursday, the store recieved a 15 gallon shipment. The store then had 22 gallons in stock. How many gallons of water did the store have on Monday morning?

Solution

1/2x - 5 - 12 + 15 = 22

1/2x - 2 = 22

1/2x = 24

x = 48

So, the store had 48 gallons of water on Monday morning.