exam Maths Puzzle Numerical Ability

Ten liters of 25% salt solution and 15 liters of 35% salt solution are poured into a drum originally containing 30 liters of salt solution. What is the percent concentration of sal

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Can someone help me solve this problem?

I need to solve the following equation for x, and show proof:

7(3x + 4) = 8(2x + 5) + 13

Thanks,
Sher i need help setting up this proof...
Given that alternate interior angles are congruent prove that alternate exterior angles are congruent