Sara has 8 red-coloured pens and 20 yellow-coloured pens. She wants to create groups of pens such that there are the same number of red-coloured pens and yellow-coloured pens in each group and there are no pens left over. What is the greatest number of groups that she can create?
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hcf of 8 and 20 is 4 so,greatest number of groups that she can create is 4
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