Final answer:
To make a mug weighing 3/4 lb from a lump of clay weighing 1 lb, you need to discard 1/4 lb of clay. The correct answer is C) 1/4 lb.
Step-by-step explanation:
To determine how much clay you need to discard to make a mug weighing 3/4 lb from a lump of clay weighing 1 lb, you need to subtract the desired weight of the mug from the weight of the lump of clay.
Here's the calculation:
- Weight of the lump of clay: 1 lb
- Desired weight of the mug: 3/4 lb
- Clay to be discarded = 1 lb - 3/4 lb
- Clay to be discarded = 4/4 lb - 3/4 lb
- Clay to be discarded = 1/4 lb
Therefore, you need to discard 1/4 lb of clay to make a mug weighing 3/4 lb. The correct answer is C) 1/4 lb.