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The problem can be solved using a system of equations. Let's break it down:

Let \( x \) be the total cost of the shirts and \( n \) the number of people contributing.

1. When each person contributes 20 soles, they are short 40 soles. This gives the equation:
   \[
   20n = x - 40
   \]

2. When each person contributes 25 soles, they have 5 soles left over. This gives the equation:
   \[
   25n = x + 5
   \]

Now, we can solve these two equations to find \( x \) (the total cost of the shirts).

### Solving the system of equations:

- From the first equation: \( 20n = x - 40 \), solve for \( x \):
  \[
  x = 20n + 40
  \]

- Substitute this into the second equation: 
  \[
  25n = (20n + 40) + 5
  \]
  Simplifying:
  \[
  25n = 20n + 45
  \]

  Solving for \( n \):
  \[
  5n = 45 \implies n = 9
  \]

- Now substitute \( n = 9 \) back into the equation for \( x \):
  \[
  x = 20(9) + 40 = 180 + 40 = 220
  \]

Thus, the total cost of the shirts is **220 soles**.

The correct answer is **D) 220**.

Would you like a further breakdown or explanation of this solution? Here are five related questions you could explore:

1. How do systems of equations work in other real-life problems?
2. What are different methods to solve systems of equations (like substitution or elimination)?
3. How do we solve more complex systems with three or more variables?
4. What happens if two equations in a system do not intersect?
5. How can inequalities be solved similarly to systems of equations?

**Tip:** When solving word problems, it's useful to assign variables to unknowns and translate the text into mathematical expressions before solving.

Unas personas hacen una colecta para comprar camisetas. Si cada uno colaborara con 20 soles, les faltaría 40 soles; entonces deciden aumentar la colaboración a 25 soles y ahora les alcanza y sobra 5 soles. ¿Cuánto cuesta las camisetas?

Learn how to resolve a system of equations to determine the cost of t-shirts when multiple people contribute varying amounts. This problem involves basic algebraic concepts, using a step-by-step approach to solve for the total cost. Suitable for students in Grades 8-10.

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