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Dipa finds the average of 10 two 2 digit numbers. If she interchanges the digits of one number (like 18 for 81) she finds average decreases by 1.8 from original. What was the difference of the two digits of the number?

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Dipa finds the average of 10 two 2 digit numbers. If she interchanges the digits of one number (like 18 for 81) she finds average decreases by 1.8 from original. What was the difference of the two digits of the number?






 
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