exam Maths Puzzle Numerical Ability

Solve.

x2 + 3 = -17

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exam Other Question

Achemist needs to mix a 75%saltwater solution with a 50% saltwater soluton to obtain 10 gallons of a 60% salt water solution. How many gallons of each of the solution must be used? (t^3-3t^2+5t-6)/(t-2)