Like in a pet store, grocery store, etc.Thanks a lot!
He will use x bushels of 50%, and 6 - x bushels of 100%. The result will be: .50 * x + 6 - x = .6 * 6 = 3.6 -x/2 = -2.4 x = 4.8 4.8 bushels of 50/50 mix contains 2.4 bushels of pure vermiculite adding 1.2 to make it 6 and you have (2.4 + 1.2) / 6 = 3.6 / 6 bushels of pure vermiculite = 60%. He can also do it this way, using his whole 5 bushels: Let x = amount of 100% vermiculite to add. 5 bushels of 50% vermiculite = 2.5 bushels of pure vermiculite. 2.5 + x = .60 * (5 + x) [ existing vermiculite + added = 60% of total ] 2.5 + x = 3 + .60 x .40 x = .5 x = 1.25 bushels added. Then he will have 6 1/4 bushels of the new mix. which will be 60% vermiculite. ( 3.75 / 6.25 = 0.60 ) If he then throws away 1/4 bushel of the new mix, he will have the desired mix in the desired quantity.
