Question

The sum of two integers is 20. If one of them is −5 then the other is
(a) 25
(b) −25
(c) 15
(d) none of these

Answer 1

(a) 25

Let the other integer be x
x + (-5) = 20
$\Rightarrow$x - 5 = 20
$\Rightarrow$x = 25

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