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# Use string interpolation to return the remainder inside the sentence βThe remainder of a divided by b is c.β where a is

I am doing this code. I need help with understanding what they want

method.rb
```def mod(a, b)
end
```

Hi Sanchari,

I'll use an example with actual numbers to see if that helps you understand what the challenge wants.

Suppose the challenge tester calls your method like this:

```mod(7, 3)
```

Your method should return the string "The remainder of 7 divided by 3 is 1."

You have to achieve that by using the local parameters `a` and `b` and string interpolation.

Let me know if you're still stuck.

so it is asking for return "The remainder of #{a} divided by #{b} is #{c}."

That's close except `c` is an undefined variable. a and b will be whatever was passed in but c does not have a value. It needs to be the result of the mod operation.

You could either add one line before that where you assign a value to c

```c = a % b
# and then the return statement
```

or you could skip the c variable and put the mod expression directly in place of c

``` return "The remainder of #{a} divided by #{b} is #{a % b}."
```