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A 200 cm long, 100 cm wide, 1 cm thick steel plate, after forging, the width does not change, and the length increases to 320 cm. What is the thickness of the steel plate after forging? (answer with the equation of one variable once)
The volume of the steel plate does not change,
The volume is 200 * 100 * 1 = 20000 cubic centimeters
After forging, the area of rectangle formed by length and width is 320 * 100 = 32000 square centimeters
20000 / 32000 = 5 / 8 = 0.625cm
Equation: if the thickness after forging is x cm, then 320 * 100 * x = 200 * 100 * 1
x=0.625
Answer: the thickness of steel plate after forging is 0.625cm
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