Understanding Proportions: If 3 books cost $15, how much would 10 books cost?

When it comes to proportions in math, it's essential to understand the concept of equal ratios. In this scenario, if 3 books cost $15, we can set up a proportion to find the cost of 10 books.

Let's represent the cost of 3 books as $15. We can set up the proportion as follows:

$\frac{3}{15} = \frac{10}{x}$

By cross-multiplying, we get:

$3x = 150$

Solving for x, we find that the cost of 10 books would be $50. Therefore, if 3 books cost $15, 10 books would cost $50.

Understanding proportions not only helps in solving practical problems but also lays the foundation for more complex mathematical concepts.

Remember, practice makes perfect!