Question

A chemist needs to mix a 2% acid solution and a 10% acid solution to make 6000 millimeters of a 5% acid solution

Answer 1

t=2%
e=10%

t+e=6000

2t+10e=6000*5
2t+10e=30000
divide both sides by 2
t+5e=15000

we have

t+e=6000
t+5e=15000
multiply first equation by -1 and add to second

-t-e=-6000
t+5e=15000 +
0t+4e=9000

4e=9000
divide both sides by 4
e=2250

sub back

t+e=6000
t+2250=6000
minus 2250 from both sides
t=3750


3750ml of the 2% solution
2250ml of the 10% solution