You can write the information of the first sentence as -

`n = 45x + 18`

where x can be 0,1,2,3ā¦

Now, you can take 9 as a common factor and rewrite as -

`n = 9(5x + 2)`

ā which tells us that n is divisible by 9

Thanks but Iām not looking for the solution actually. I would like to know how 45*0 has a remainder of 18 in this case.

(45*0 + 18) has a remainder of 18 right?

got it. thanks

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