One kit needs 2 A-parts, 3 B-parts and 1 C-parts. Physical stocks are A=75, B=92, C=45; 11 B-parts are reserved for another job. Only complete kits may ship; no substitutes or partial kits are allowed. Build the maximum possible kits from unreserved stock.
Calculate the A-parts left after kit assembly. Keep intermediate values unrounded; round the final answer to 4 decimal places if needed.