NEED HELP ASAP
2 answers:
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0.9 as a fraction is: 
What place is the '9' in? It's in the tenth place.
0.9 can be said as
Nine
tenths
=
What place is the '9' in? It's in the tenth place.
0.9 can be said as
Nine
so the 5 gallons ones is 40% acid, how much acid solute is in it anyway? well just 40% of 5 or namely 0.4*5 = 2 gallons.
the 3 gallons one is 50%, likewise it has 0.50 * 3 = 1.5 gallons of acid solute in it.