Carl had 1920 dollars at first.
Given that Carl had $840 more than Daisy.
Let Daisy money = M
Carl Money = 840 + M
If Carl spent 3/4 and Daisy spent 3/5 of their money respectively. That is,
for Carl: 3/4 × (840 + M) = 630 + 3M/4
The remaining amount = (840 + M) - (630 + 3M/4)
Amount = 210 + M/4
for Daisy: 3/5 × M = 3M/5
The remaining amount = M - 3M/5
Amount = 2M/5
Daisy was then left with $60 more than Carl. Then,
2M/5 = 60 + 210 + M/4
2M/4 = 270 + M/4
Collect the like terms
2M/4 - M/4 = 270
M/4 = 270
M = 4 × 270
M = 1080 dollars
Since Carl had $840 more than Daisy, Carl amount = 840 + 1080
Carl amount = 1920 dollars
Therefore, Carl had 1920 dollars at first.
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