Answer with explanation:
Weight of Oxygen in Anne's body =38.6 Kg
Weight of Hydrogen in Anne's body =6.1 Kg
Weight of Other Elements in Anne's Body =20.4 Kg less than than the weight of oxygen.
=38.6 Kg - 20.4 Kg
= 18.2 Kg
So,Weight of gases in Anne's body =38.6 Kg +6.1 Kg +18.2 Kg
=62.9Kg