book Maths Puzzle Numerical Ability

Hi i'd really appreciate it if someone could help me with this word problem.
A full tank contains 729 litres of pure acid. First m litres of acid was poured out and the tank was f

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book Other Question
If the ordered pair (3,a) is the solution to the system 3x-4y=1
5x+2y=19 find a.


Graph the system: y=2x-7 find the mistake in the problem and fix it.
if y = 30 and h = 2

6(30) 6+2-5
6y h+6-5
6(15)+6-5
90+6-5
96-5
91