exam Maths Puzzle Numerical Ability

please help me in giving me steps to solve systems equations with real world problem
example
The sum of two numbers is 25.One number is twice the second plus seven. what are the

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exam Other Question

Driving down a moutain, Tom finds that he has descended 1800 ft in elevation by the time he is 3.25 mi, horizontally away from the top of the moutain. Find the slope of his descent I dont understand how you are supposed to justify each step because it just doesnt make sense to me...