exam Maths Puzzle Numerical Ability

A biologist is developing two strains of bacteria. Each sample of Type I bacteria produces four new viable bacteria, and each sample of Type II produces three new viable bacteria.

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x^-2 - 9x^-1 + 18 = 0 how much antifeeze should be added to 300 gallons of 30% antifreeze solution to raise the antifreeze solution to 40%?