How many pounds of salt at 70 cents/lb must be mixed with 45 lbs of salt that costs 40 cents/lb so that a merchant will get 20% profit by selling the mixture at 48 cents/lb?
Choose the correct choice.
A) 5	B) 9	C) 40	D) 50	E) 25
Selling price is 48 cents/lb   For a 20% profit, cost price should be 40 cents/lb (CP*6/5 = 48)   Basically, you need to mix 40 cents/lb (Salt 1) with 70 cents/lb (Salt 2) to get a mixture costing 45 cents/lb (Salt Avg)   weight of Salt1/weight of Salt2 = (Salt2 - SaltAvg)/(SaltAvg - Salt1) = (70 - 45)/(45 - 40)= 
<gadget id="calculator">(70 - 45)/(45 - 40)</gadget>
<output>5</output>
5/1   We know that weight of salt 1 is 45 lbs. Weight of salt 2 must be 9 lbs.   Answer (9)
<result>B</result>
How many pounds of salt at 70 cents/lb must be mixed with 45 lbs of salt that costs 40 cents/lb so that a merchant will get 20% profit by selling the mixture at 48 cents/lb?