I really need help on this not quiet understanding it.

John's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs John $5.70 per pound, and type B coffee costs $4.55 per pound. This month, John made
144 pounds of the blend, for a total cost of
$752.95. How many pounds of type B coffee did he use?

Question

I really need help on this not quiet understanding it.

John's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs John $5.70 per pound, and type B coffee costs $4.55 per pound. This month, John made 
144 pounds of the blend, for a total cost of 
$752.95. How many pounds of type B coffee did he use?

phi · Answer

if you have A pounds of the first type and B pounds of the second type
what is A+ B ?
any idea ?

phi · Answer

notice this sentence 
John made 144 pounds of the blend,

teller · Answer

I'll be right back i have to step out of the house