We can set up an equation to represent the given information:
8x + 3y = 203
where x represents the first part and y represents the second part. We know that the total of the two parts is 36, so we can add another equation to represent this:
x + y = 36
To solve for x, we can use elimination method by multiplying the second equation by 8 and subtracting it from the first equation:
8x + 3y - 8x - 8y = 203 - 288
-5y = -85
y = 17
We can substitute this value of y back into the second equation to solve for x:
x + 17 = 36
x = 36 - 17
= 19
Therefore, the first part is 19.