Carson is sorting seaweed for various uses. 50% of the seaweed is only good for starting fires. 25% of what's left can be eaten by humans, and the rest is fed to livestock. If Carson harvests 400 pounds of seaweed, how many pounds are fed to livestock? Let's be accurate as possible.
First find what percent of the seaweed can be used for something besides starting fires: 400 pounds / 2 = 200 pounds. Then divide that amount by 4 to find the amount that's eaten by humans: 200 pounds / 4 = 50 pounds. Then subtract that amount from the 200 pounds to find how much is eaten by livestock: 200 pounds - 50 pounds = 150 pounds.
The answer: 150.