The cooler for the water had 28 bottles in it. If the
lifeguards drank 15 bottles, how many are left?

After the lifeguards enjoyed their refreshing drinks, you can find out how many bottles are left by subtracting the 15 bottles they consumed from the original 28. So, 28 - 15 equals 13. Therefore, there are 13 bottles left in the cooler for the next thirsty swimmer!

Math can sometimes feel like a puzzle, and this one is no different! To avoid mistakes, it’s always a good idea to double-check your subtraction. You might even consider using a number line or counters if you’re a visual learner. And remember, if you ever end up with a negative number, it’s a sign that you may need to rethink your math!