How many cups in one Libra?

You can't convert directly between libras and cups because they measure different things:

* Libra (lb) is a unit of mass (weight).

* Cup (c) is a unit of volume.

To convert between mass and volume, you need to know the density of the substance you're measuring.

For example:

* A libra of water will have a different volume than a libra of flour because they have different densities.

To make a conversion, you need to:

1. Specify the substance you are measuring.

2. Look up the density of that substance.

3. Use a conversion formula to relate mass, volume, and density.

Let me know if you have a specific substance in mind and I can help you with the conversion!