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Set A contains points whose abscissa and ordinate are both natural numbers. Point B, an element in set A has the property that the sum of the distances from point B to point (3,0) and the point (0,5) is the lowest among all elements in set A. What is the sum of abscissa and ordinate of point B?

Set A contains points whose abscissa and ordinate are both natural numbers. Point B, an element in set A has the property that the sum of the distances from point B to point (3,0) and the point (0,5) is the lowest among all elements in set A. What is the sum of abscissa and ordinate of point B? Correct Answer 4

Calculation:

Any point on the line (x/3) + (y/5) = 1 will have the shortest overall distance.

However, we need to have integral coordinates. So, we need to find the points with integral coordinates as close as possible to the line 5x + 3y = 15.

∴ Substitute x =1, we get y = 2 or 3

∴ Substitute x = 2, we get y = 1 or 2

∴ Sum of distances for (1, 2) = √8 + √10

∴ Sum of distances for (1, 3) = √13 + √5

∴ Sum of distances for (2, 1) = √2 + √20

∴ Sum of distances for (2, 2) = √5 + √13

⇒ √5 + √13 is the shortest distance.

∴ Sum of abscissa + ordinate is 4.

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