He uses
of brand 1 at cost
and he uses
of brand 2 at cost 
Further explanation:
Given:
The cost of first brand is 
The cost of second brand is 
Explanation:
The grocer uses a brand of coffee worth
a pound with another brand worth
a pound.
Let the amount of first brand coffee he blend is
.
Let the amount of second brand coffee he blend is
.
The total amount of coffee is 480 pounds.

The price of the blended coffee is 
The equation from the price of the coffee can be obtained as follows,

Solve the equation to obtain the value of
.

The value of
can be obtained as follows,

He uses
of brand 1 at cost
and he uses
of brand 2 at cost 
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Answer details:
Grade: High School
Subject: Mathematics
Chapter: Linear equation
Keywords: coffee, grocer, wishes, blend, different, coffee brands, 480 pounds, sell, $2.68, brand worth, brewed, directions, pounds, coffee beans, yields, kilogram, kg, required, produced