Question

What is to be added to 99.9 to get 298.99

Answer 1

Let the no be x

99.9+x=298.99

x=298.99-99.9

x=199.09

Hence ,199.09 should be added to 99.9 to get 289.99

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Answer 2

Taking the unknown number as a variable(a)

99.9+a=298.99

a =298.99-99.9

a=199.09