The machine which prints photographs at Snippysnaps runs for the same time every day. It prints colour photographs at a constant rate and monochrome (black and white) photographs at a different constant rate. On Monday, the machine printed 2100 colour photographs and 2450 monochromes photographs. On Tuesday it printed 2800 colour photographs and 1400 monochrome photographs. On Wednesday, it printed only monochrome photographs. How many of these were there?
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Junior Mathematical Olympiad 2000 (2000)
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