Question 347271
13x+11(336-x)=336*12
13x+3,696-11x=4,032
2x=4,032-3,696
2x=336
x=336/2
x=168 kilograms of $13 coffee.
336-168=168 kilograms of $11 coffee.
Proof:
13*168+11*168=336*12
2,184+1,848=4,032
4,032=4,032