4.80
4.80. 8 dollars = 800 cents. 800 x (3/5) or .6 = 480.
18 dollars
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
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.
4.80
4.80. 8 dollars = 800 cents. 800 x (3/5) or .6 = 480.
18 dollars
One and three fifths.
5/5 + 3/5 = 8/5 8 fifths.
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
8 3/543/8, or 8.6
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.
8*3/5 = 24/5 = 4.8
Four fifths of 20 dollars = 16 dollars.
8/5 x 7/2 = 56/10 = 5.6 or five and three fifths
Expressed with a denominator of 5, 1 3/5 is equal to 8/5 or eight fifths.