Question 901362
a+b=4,
0.1*a+0.6*b=0.5*4
a=4-b
0.1*(4-b)+0.6*b=2
0.4-0.1b+0.6*b=2
0.5*b=1.6
b=3.2
a=4-b
a=0.8 tsp at 10% b=3.2 tsp at 60%
check
0.1*0.8+0.6*3.2=0.5*4
0.08+1.92=2
2.0=2
ok