7-11 sells soda refill cups for $3.99. Each refill costs $0.99. Last month, Santiago spent $18.84 on a cup and refills. Write and solve an equation to find the number of refills that Santiago bought.
To get how much he spent of refills subtract the amount of the cup 18.84-3.99=14.85 To get how many times he refilled his cup divided by cost per refill 14.85/0.99 = 15 Santiago refilled his cup 15 times
