exam Maths Puzzle Numerical Ability

how many milileters of a 20% acis solution must be mixed with 30ml of an 80% acid solution to make a 32% acid solution? i have to show a chart and fill it out

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Please help me with this:

log base 7 [log base 2(log base 3(x-1) - log base 3 (x+2))]=0
Please solve the equation. 6(5g+2)=30g.

Thank u for all your help!