Mathematics, 23.07.2019 01:30 stricklandashley43

If bill has 78,78,and 78 for his 3 tests, wat must he get on his 4th test in order to have an 80 average ?

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If bill has 78,78,and 78 for his 3 tests, wat must he get on his 4th test in order to have an 80 ave...