208e Determine the mean of one group given the combined mean and the mean of the other group.

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There are 29 boys and 17 girls in a class. The boys and the girls have some counters.

The mean number of counters that the boys have is 29.

The mean number of counters that the whole group have is 30.

Work out the mean number of counters the girls have.
Give your answer correct to 1 decimal place.

counters