exam Maths Puzzle Numerical Ability

how much antifeeze should be added to 300 gallons of 30% antifreeze solution to raise the antifreeze solution to 40%?

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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. graph each relation and state its domain and range

x=sqrt(y-1)