Answer:
1/7
Explanation:
To find the fraction of homework completed before dinner, we need to divide the number of problems completed before dinner by the total number of assigned problems.
In this case, you completed 3 problems before dinner, out of a total of 21 problems assigned.
To calculate the fraction, we can write this as a ratio: 3/21.
However, we can simplify this fraction by finding the greatest common divisor (GCD) of 3 and 21, which is 3.
Dividing both the numerator and the denominator by 3, we get 1/7.
Therefore, you completed 1/7 of your homework before dinner.