Chemist has 30 kg of mixture that is 1/7 lead and 6/7 copper.
How many kg of lead must be added so resulting mixture is 2/9 lead.
amount of lead must add up:
30 * 1/7 + x = (30+x) * 2/9
x = 150/49 kg
How many kg of lead must be added so resulting mixture is 2/9 lead.
30 * 1/7 + x = (30+x) * 2/9
x = 150/49 kg