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The sum of two positive numbers is 65 and the sum of their squares is 2125. What is the smaller number?

Answer and explanation

Correct answer: 30

Let the smaller positive number be x. Then the other number is 65−x. The condition on the squares gives x²+(65−x)²=2125. Expanding, x²+4225−130x+x²=2125, so 2x²−130x+2100=0. Dividing by 2 gives x²−65x+1050=0. This factors as (x−30)(x−35)=0, so the two numbers are 30 and 35. Since x was defined as the smaller number, x=30 and option B is correct. A check confirms that 30+35=65 and 30²+35²=900+1225=2125. Option C is the larger number, while options A and D do not form a pair satisfying both given conditions.

Related tags

Quadratic-EquationsWord-ProblemSum-Of-SquaresAlgebraic-ModellingWord Problems And ApplicationsQuadratic EquationsMathematicsClass 10 Mcq

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