Question 1041520
Let n be the amount of 50% broth. Then:
.5n+.3(200-n)=.42(200)
.5n-.3n+60=84
.2n=24
n=120
200-n=80

Let n be 80% Columbian beans. Then:
.8n+.5(100-n)=.68(100)
.8n-.5n+50=68
.3n=18
n=60
100-n=40

50% sugar solution=50% water 
10% sugar solution=90% water 
pure water=100% water
.5n+1(8)=.9(n+8)
8+.5n=7.2+.9n
.8=.4n
n=2
You need 2 quarts of 50% sugar for your solution. ☺☺☺☺