exam Maths Puzzle Numerical Ability

The sum of two numbers is 80. The larger number is 8 less than 3 times the smaller number. find the smaller number

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exam Other Question

How would you write an equation in standard form for an ellipse with foci(5,0)and (-5,0) and y- intercepts of 7 and -7? The polynomial 1600x^3+1200x^2+800x represents your savings, with interest, from a summer job after three years. The annual interest rate equals x-1. Find the interest needed so that you will have $4000 at the end of three years.