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Math problem: The length of a rectangle is 30 cm. After zooming in 4 to 1, the area increases by 150 cm. What is the width of the prototype?
Hello:

The enlarged length is 30 * 4 = 120cm, and the increased width is 4.

Increased area = increased length * increased width-original length * original width

150= 120*4 width -30* width

150=450 width

Width = 1/3cm

The width of the original image is 1/3cm.