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If Leo and Amelia each had $12u at first, Leo spent 3/4 and left with $ 12u/4= $ 3u and Amelia spent 1/3 and left with $ 2/3 * 12u = $ 8u

8u – 3u = 15

5u = 15

u = 3

24u = 72

They had $ 72 altogether at first. 

Note: 12u was chosen as LCM for 3 and 4 at the denominator is 12.

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