book Maths Puzzle Numerical Ability

In June I purchased 300 shares of Oracle stock at $20 per share. In August I purchased an additional 400 shares at $25 per share. In November bI purchased an additional 400 shares

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how many liters each of two solutions containing 30% and 20% acid, respectively, must be mixed to prepare 50 liters of solutions containing 26% acid? i need help solving 6x+5-7x=10-4x+3 and 5-2(x+5)=3(x-2)-1