How much of an alloy that is 40% copper should be mixed with 500 ounces of an alloy that is 60% copper in order to get an alloy that is 50% copper?

Answer this question only if you know the 30 points and

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

What could explain what happened when the time was equal to 120 minutes