Question 1162831
25t comp. with old machine in t hours
35t comp. with new machine in t hours

t hours for old machine, and 14-t hours for new machine, and sum is 430 comp.
25t+490-35t=430
-10t=-60
t=6 hours for the first machine (150 parts)
14-t=8 hours for the second machine (280 parts)

to answer the question
O+N=14
25O+35N=430