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There are 6 units in an exam course . Each unit is marked out of 100 To get grade A , the mean mark of all six units must be at least 80 Tom has taken five units . His mean mark is 78 To get grade A , how many marks must he get on the last unit ?

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There are 6 units in an exam course . Each unit is marked out of 100 To get grade A , the mean mark of all six units must be at least 80 Tom has taken five units . His mean mark is 78 To get grade A , how many marks must he get on the last unit ?​

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Another question on Mathematics

There are 6 units in an exam course . Each unit is marked out of 100 To get grade A , the mean mark of all six units must be at least 80 Tom has taken five units . His mean mark is 78 To get grade A , how many marks must he get on the last unit ?