Final answer:
Mary received €5.
Step-by-step explanation:
To find out how much Mary got, we need to determine the fraction of the money that Dónal received. Since Dónal got €2.40, which is the remainder, we can represent it as 3/8 of the total money. This means Mary received 5/8 of the total money. To find out how much Mary got, we can use a proportion:
5/8 = Mary's amount / Total amount
Now, we can solve for Mary's amount by cross multiplying:
5 * Total amount = 8 * Mary's amount
To make it easier, we'll assume the total amount is 8 units, so 5 * 8 = 8 * Mary's amount.
40 = 8 * Mary's amount
To isolate Mary's amount, we divide both sides by 8:
Mary's amount = 40 / 8
Mary's amount = €5