Weighing Luggage If Travelling By Air In A Family Group, Is The Checked In Luggage Weighed Collectively Or Individually?

If travelling by air in a family group, is the checked in luggage weighed collectively or individually? - weighing luggage

I am going abroad with my husband and my 3 children who travel by air (economy). When our baggage allowance 20 kg each, all of our things weighed together in the test - which may mean up to 100 kg, and luggage of each person individually weigh?