9000139505

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9000139505
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The average mass of twelve oranges is \(120\, \mathrm{g}\). To this amount we add another six oranges with the average mass \(150\, \mathrm{g}\). Find the change in the average mass of oranges.
The average mass increases by \(10\, \mathrm{g}\).
The average mass increases by \(8.3\, \mathrm{g}\).
The average mass increases by \(25\, \mathrm{g}\).
The average mass decreases by \(8.3\, \mathrm{g}\).