ground radiation
The original fraction is -145/(-282) or it could be 850/35700 or one of infinitely many possibilities.
The quotient is larger than the original fraction.
Oxygen, now about 20% of the atmosphere, was not part of the original atmosphere of hthe Earth. It was produced by plants, after life developed.
Jupiter
The fraction is the remainder divided by the original divisor.
Mostly from plants.
its 1 over 3 its 1 over 3
It is the denominator of the original fraction. If the fraction has been simplified you have no way to get back to the total.
You multiply the denominator by the whole number, then add the numerator of the original fraction to get the numerator of your new fraction. The denominator stays the same as the original. Then you simplify into lowest terms.
the reciprocal of the original fraction
... less than the original fraction.
Since the original atmosphere, the gases which have decreased are water vapour and carbon dioxide and the gases which have increased are nitrogen, oxygen