exam Maths Puzzle Numerical Ability

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

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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 what is the slope of the direct variation y=-2/3x?? how do you find it. what is the relationship between the constant of variation and the slope???