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Substitution Method to Find the Solution of Pair of Linear Equations

Sum of digits...

Question

Sum of digits of a 2 digit number is 10. Sum of the number and its reverse equals 110. Represent it graphically.

A

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B

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C

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D

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Solution

The correct option is B

Let x be tens digit and y be units digit.

$x + y = 10$

$10 x + y + 10 y + x = 110$

$\Rightarrow 11 x + 11 y = 110$

$\Rightarrow x + y = 10$

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