Final answer:
To find out how many grams of ice cream your brother ate, multiply the total amount of ice cream by the fraction representing the portion he ate, which is 1/6. Therefore, your brother ate 12 grams of ice cream.
Step-by-step explanation:
To find out how many grams of ice cream your brother ate, we need to multiply the total amount of ice cream by the fraction representing the portion he ate, which is 1/6.
Using the given weight of ice cream, 72 grams, we can calculate: 72 grams x 1/6 = 12 grams.
Therefore, your brother ate 12 grams of ice cream.