How many pounds of an $83 per pound substance must be mixed with an $11 per pound substance to get 240 lbs of an alloy which will cost $28 per pound? Round to the nearest pound.
Answer 57 lbs
183 lbs
205 lbs
35 lbs

Question

How many pounds of an $83 per pound substance must be mixed with an $11 per pound substance to get 240 lbs of an alloy which will cost $28 per pound? Round to the nearest pound.
Answer    57 lbs 
   183 lbs 
   205 lbs 
   35 lbs

anonymous · Answer

let x be the mass of $83 substance
and y be the mass of $11 subtance

x + y = 240
83x + 11y = 28*240

anonymous · Answer

can you solve these?
x + y = 240
83x + 11y = 6720

or want to know how i get the equations?

anonymous · Answer

You Just Lost Me

anonymous · Answer

let x be the mass of $83 substance
and y be the mass of $11 subtance
got this?

both of them have to add up to 240 pounds of the new subtance.
x + y = 240

the price for 240 pounds of the new substance has to be $28 times 240 pounds.
so 83$ each pounds times some pounds of the first substance + and $11 each pounds times some pounds of the second substance.
83x + 11y = 28 * 240 = 6720