Let x be the number of plates removed from the box.
Hasan figured out the movers' weight limit was 20 pounds. Since a pound is equal to 16 ounces, each box can hold 20 * 16, or <<20*16=320>>320 ounces.
Each plate weighs 10 ounces, so the weight of the plates in the box after Hasan removes enough plates to satisfy the movers' weight limit is (38 - x) * 10 ounces
Since these two values are equal, we can write the equation (38 - x) * 10 = 320.
Dividing both sides by 10 leaves 38-x = 32.
Adding x to both sides gives 38 – x + x = 32 +x, or, 38 = 32 +x
Subtracting 32 from both sides gives the value of x, which is the number of plates removed from the box, 38 -32 = 32 + x – 32, or, 6 = x
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