One box of laundry detergent weighs 6 3/4 pounds. there are 12 of these boxes in a case. how much does the case weigh?

6 3/4 is 27/4. 12/1 ×27/4= 324/4
324/4 is simplified to 81
The case weighs 81 pounds

Hello!

To find the total weight of 12 cases, knowing that each one weighs 6 3/4 pounds, you must set up a multiplication expression:
6 3/4 * 12

Because 6 3/4 is a mixed fraction, convert it to an improper fraction to make multiplying it by 12 more convenient. To do this, multiply the whole number by the denominator and add its product to the numerator to get the numerator of the improper fraction. The denominator will remain the same. When you do that, you should get that the improper form of 6 3/4 is
27/4.

Now that you have 6 3/4 converted to an improper fraction, multiply
27/4*12

This would result in 324/4 which would simplify to 81.

Therefore, your final answer would be that 12 boxes of laundry detergent cases would be 81 pounds. :)