exam Maths Puzzle Numerical Ability

5x2y6z4 - 15x4y5z3 + 20x3y5z2 please help me solve this.

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Determine the sum for the geometric series 1/2 - 1/3 + 2/9 - 4/27 +... A researcher orders a broth of 7.5% glucose for her lab. However, she needs a stronger broth, one that is 24.9% glucose. Fortunately, she has 26.9 liters of 36.1% glucose broth in the stock room. How much 24.9% glucose broth can she make?