My problem is the following:
In a particular steel mixture, $20 \%$ of it consists from chromium and $10\%$ from nickel. How much of this steel mixture can be produced, if we have $1200$kg of chromium and $900$kg of nickel. The other steel ingredients don't limit the amount of steel mixture we can produce.
a) $9 000$kg
b) $7000$kg
c) $6000$kg
d) $4500$kg

My question is: Is the correct answer c) $6000$kg?
P.S. Please let me know if the task is unclear, I translated it from another language the best I could ;)