PLEASE HELP MEEEE!!!!

Question

anonymous · Answer

David's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs David $4.25 per pound, and type B coffee costs $5.30 per pound.This month, David made 120 pounds of the blend, for a total cost of $578.25 How many pounds of type B coffee did he use?

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anonymous · Answer

NUMBER OF POUNDS OF TYPE B COFFEE ?

anonymous · Answer

@TheSmartOne PLEASEEE HELP MEEEEE

johnweldon1993 · Answer

Well....if the total cost is 578.25

we know some of that was from A and some from B
 so lets write

$$\large 4.25A + 5.30B = 578.25$$

and we also know there was a total of 120 pounds with some amount of A and some amount of B

$$\large A + B = 120$$

we have 2 equations and 2 unknowns...can you take it from here?