A school group charters three identical buses and occupies

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A school group charters three identical buses and occupies 4/5 of the seats. After 1/4 of the passengers leave, the remaining passengers use only two of the buses. The fraction of the seats on the two buses that are now occupied is

1. 8
  9
2. 7
  10
3. 7
  9
4. 9
  10

Correct Option: A

n = 6q + 4
2n = 12q + 8
Dividing 8 by 6 the remainder = 2