book Maths Puzzle Numerical Ability

The sum of two numbers is 26. Find the two numbers if the larger number is 2 less than three times the smaller number.

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book Other Question

The curve y=ax^2 +bx+c passes through the points (x1,y1), (x2,y2), and (x3,y3). Show that the coefficients a, b, and c are a solution of the system of linear equations whose augme if a number is increased by its square the result is 72.find the number.