exam Maths Puzzle Numerical Ability

WORD PROBLEM:

How much water should be added to 8 ML of 6% Saline solution to reduce the concentration to 4%?

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exam Other Question
10a2b5c-5 (a to the 2nd power b to the 5th power and c to the -5th power)
__________ (over or divided by)

2a2b-4c4 (a to the 2nd power b to the -4th power and c to the 4th power) x^3-x^2+4*x-4=0

thanks a million:)