Question

nine added to thrice a whole number gives 45. find the number

Answer 1

let the numbers be 3x and 9
than, 9 + 3x = 45
3x = 45 - 9
3x = 36
x = 12
Number is 36 and 9
hope it helps you
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Answer 2

let the number be=x

A.T.Q    3x+ 9 = 45

            3x= 45-9

            3x= 36

              x= 36/3

             x= 12

therefore, the number is 12