Problem with calculation

Hi

I have been trying to use the equation:

int Temp;
   Temp = 680*((N-82)/(920-82));
   return Temp;

N=920 - I would expect temp would be 680 and the result is 680 which is correct


But when I tried to use other values below, I keep getting zero.

Then N - 900
Result: 0

adc_result - 700
result:0

adc_result - 500
result:0

adc_result - 300
result:0

adc_result - 100
result:0

I don't understand why this happened.

Arron