Question

Mickey used these calculations to find how much he would spend on 7 cartons of eggs, if 12 cartons of eggs cost $22.20. Describe his error.

12 cartons(÷22.20)
$22.22(÷22.20)


Unit price = $0.54
$0.54(7) = $3.78

Answer 1

Mickey's error is in his calculation of the unit price and the total cost of 7 cartons of eggs. He divided the total cost of 12 cartons by 12 instead of dividing it by the number of eggs in one carton. Therefore, he arrived at an incorrect unit price and subsequently an incorrect cost for 7 cartons.

Step-by-step explanation:

Mickey's error is in his calculation of the unit price. He divided the total cost of 12 cartons of eggs, which is $22.20, by 12 instead of dividing it by the number of eggs in one carton. To find the unit price, he should have divided $22.20 by the number of eggs in one carton. Let's say each carton contains 10 eggs. So, the correct calculation would be: $22.20 / 10 = $2.22.

Then, to find the cost of 7 cartons of eggs, Mickey should have multiplied the unit price ($2.22) by the number of cartons (7). This gives us: $2.22 * 7 = $15.54. Therefore, Mickey would spend $15.54 on 7 cartons of eggs, not $3.78 as he calculated.

Answer 2

Mickey incorrectly calculated the unit price:

`(12)/(22.20) = 0.54`

The correct operation is:

`(22.20)/(12) = 1.85`

Each carton costs 1.85, so 7 cartons cost

`1.85 * 7 = 12.95`