Evaluate the given problem
Problem- You are dating Moon rocks based on their proportions of uranium-238 (half-life of about 4.5 billion years) and its ultimate decay product, lead.
Part 1- Find the age for a rock for which you determine that 58% of the original uranium-238 remains, while the other 42% has decayed into lead.
T= ( ) billion years
Part 2- Find the age for a rock for which you determine that 66% of the original uranium-238 remains, while the other 34% has decayed into lead.
T= ( ) billion years
I need experts help to calculate the age for a uranium rock and if possible please list step by step.