# Empty and full

An empty can has a mass of 1/6 lb. When it is filled with sand, it has a mass of 7/12 lb. Find the mass of the sand in the can?

Result

s =  0.417 lb

#### Solution:

$s=\dfrac{ 7 }{ 12 } -\dfrac{ 1 }{ 6 }=\dfrac{ 5 }{ 12 } \doteq 0.4167 \doteq 0.417 \ \text{lb}$

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