Question 363187
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Hi, 
 
Let x represent the amount of pure bran flakes (an 100% solution)
.20*60oz + 1.00x = .40(60oz + x)
solving for x
.60x = .20*60oz
x = 20oz of oure bran flakes need to be added

checking our answer
12 + 20 = .40*80 = 32