Found this problem in a Facebook group. It is likely a homework problem from an undergraduate computer science class.
Solution: Python 3.10
import math
chef = [2,2,5]
customer = [4,5,6,30,123456789012]
lcm_C = math.lcm(*chef)
fx = []
for i in range(lcm_C // min(chef)):
for ti in chef:
nti = i * ti
if (nti < lcm_C):
fx.append(nti)
fx.sort()
print(lcm_C)
print(fx)
len_fx = len(fx)
for ci in customer:
k = (ci-1) // len_fx
x = (ci-1) % len_fx
print(f'{ci}: k={k} x={x} ans={k*lcm_C+fx[x]}')