Answer;
32 pounds of the blend can be made
Explanation;
If light roast is 25%, then the other part will be 100-25 = 75%
Now the ratio of the light roast to the other part will be;
25% to 75% = 1 to 3
So if light toast is 8 pounds, the other part will be 3 * 8 = 24 pounds
So the amount of blend to be made will be 8 pounds + 24 pounds = 32 pounds