The resolution 640x480 refers to a display or image that is 640 pixels wide and 480 pixels tall. To find the total number of pixels, you multiply the width by the height. In this case, 640 multiplied by 480 equals 307,200 pixels.
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This isn't a clearly worded question, but if I understand correctly, you want to know how many pixels there are in such a display.
Well, 640*480=307200.
Multiply the numbers and divide by 1,000,000 So it would be 0.3 megapixels approx.