Determine the age of a rock (in years) containing 0. 068 g of uranium-238 (t1/2 = 4. 5×109 yr) and

Determine the age of a rock (in years) containing 0. 068 g of uranium-238 (t1/2 = 4. 5×109 yr) and 0. 025 g of lead-206. (assume that all the lead-206 came from 238u decay. )