Box sand weighs 12 pounds when it is 3/4 full. It weighs 2.9 pounds when it is 1/6 full. The full weight of the box is 17.4.
The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.
Box sand weighs 12 pounds when it is 3/4 full.
It weighs 2.9 pounds when it is 1/6 full.
So, the full weight of the box
= 2.9 x 6
= 17.4
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