Exercise 9. Alice, Bernard, and Célia went on vacation. Alice spent 138 euros, Bernard 173 euros, and Célia 265 euros. To ensure the expenses are shared fairly, Alice gives a certain amount of money to Célia, and Bernard gives a certain amount to Célia. Determine the amount, in euros, that Alice gave to Célia.
Solution to exercise 9 Alice, Bernard, and Célia spend a total of $138+173+265=576$ Euros, so each should contribute 192 Euros. Consequently, Alice should give 192 $138=54$ Euros.