75 because the value of n is sum of numbers 78
1 : 21/20 : 441/400
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the jug will be filled after 6.4 minutes.
the correct equation is,
v = 2.5(6.4 - t)
v represents the empty space and t represents the time in minutes.
the jug will be filled when v = 0
putting value in the above equation,
2.5(6.4 - t) = 0
=> 6.4 - t = 0
=> t = 6.4
hence the jug will be completely filled after 6.4 minutes.
amount of tax paid: 120÷100×6.5= 7.8$
additional booking charges: 20$
original ticket cost: 120-7.8-20=92.2$