Sum of two numbers is $40$ and difference is $20$ then the two numbers are:

29, 11

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32, 8

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30, 10

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20, 20

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Solution

The correct option is D $30, 10$
Let be two numbers be A and B
$A + B = 40$
$A - B = 20$
Add two equations
We get
$A + B + A - B = 40 + 20$
$2 A = 60$
$A = 30$
as we know $A$ put this in one of the equation
$30 + B = 40$
$B = 10$
$A = 30$ and $B = 10$

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