Question 910200

a+b=1000,
0.05*a+0.2*b=0.08*1000
a=1000-b
0.05*(1000-b)+0.2*b=80
50-0.05b+0.2*b=80
0.15*b=30
b=200
a=1000-b
a=800  lb. at 5%
b=200  lb. at 20%
check
0.05*800+0.2*200=0.08*1000
40+40=80
80=80
ok
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