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**1. Homework Statement**

At the present time natual uranium found on earth consists of 99.3% uranium 238 and 0.7% uranium 235. The measured half lives of these isotopes is 6.5ee9 years and 1.0ee9 years respectvely. By assuming they were equally abundent at time of formation, estimate the age of the solar system.

**3. The Attempt at a Solution**

(1/2)^n=0.7/50

this implies 8.537 half lives.

this indicates 8.5ee9 years. This isnt the correct answer, could someone please direct me to where I am going wrong and suggest what I might like to do instead. Thanks.