Given: $7
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11 lb
Use this equation of ratios to determine the unit price of a pound of rice:
$ 7 $1
-------- = -----------
11 lb. x
11 lb x
------- = -----------
$7 $1
Cross multiplying, (11 lb)($1) = ($7)x
Divide both sides by $7 to obtain the value of x, the number of pounds of rice per dollar.
