It is nearly twice as big because 3/5 = 0.6 and 2/6 = 0.'3' recurring '3'
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18 dollars
15/40 or 3/8
3/4 + 2/5 = 15/20 + 8/20 = 23/20
Two fifths of 25 would be 10.
If Heather had enough to pay 3/5 (three fifths) of the bill, that means that Jen's $8 was 2/5 (two fifths) of the bill. If two fifths is $8, then one fifth must be $4. And if one fifth of the bill is $4, then the whole bill (5/5, five fifths) must be 4 x 5 = $20.