How many pounds of salt at 50 cents/lb must be mixed with 40 lbs of salt that costs 35 cents/lb so that a merchant will get 20% profit by selling the mixture at 48 cents/lb?
Choose the correct choice from the following choices.
A) 20	B) 15	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 35 cents/lb (Salt 1) with 50 cents/lb (Salt 2) to get a mixture costing 40 cents/lb (Salt Avg)   weight of Salt 1/weight of Salt2 = (Salt2 - Salt Avg)/(Salt Avg - Salt 1) = (50 - 40)/(40 - 35)= 
<gadget id="calculator">(50 - 40)/(40 - 35)</gadget>
<output>2</output>
2/1   We know that weight of salt 1 is 40 lbs. Weight of salt 2 must be 20 lbs.   20nswer (20)
<result>A</result>
How many pounds of salt at 50 cents/lb must be mixed with 40 lbs of salt that costs 35 cents/lb so that a merchant will get 20% profit by selling the mixture at 48 cents/lb?