Let:
x be the amount formula (oz)
3x be the amount of water (oz)
x + 3x = 120
4x = 120
x = 30
Then:
x = 30
3x = 90
A 120 oz of ready to consume infant feed should be composed of 30 oz of formula and 90 oz water.
Exercising to balance out the high calorie diet
If you don't rest between exercise sessions you may damage you body because your muscles will have no to to rest and repair.