exam Maths Puzzle Numerical Ability

Sarah has $3.50 in quarters and nickels. She has 2 more quarters than nickels. I need an algebra equation for this. Please help!!

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There were 40 students in a hostel. If the number of students increased by 5 the expenses of the mess were increased by Rs.45 per day while the averag expenditure per head diminish What is a real-life situation that follows a linear equation,with the independent ariables being years. What would the slope say about the future years.