exam Maths Puzzle Numerical Ability

How much water should be added to 6 gallons of pure acid to obtain a 30% solution?

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exam Other Question

i have been given this problem in my homework


1.866^(x-2)=1/1.244^(4.x)

any help with it would be greatly used
many thanks x
I have two questions Solve Algebraically

#5 N= -2M t 9
N= 3M -11


#6 y = 1.5x -8
y = -2.5x t 2.5