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1 Fifth of a metre is 20cm
1/5 of 1 meter = 20 centimeters.
meter
It is 1/4 of a metre
20
20
0.2sq metres or 2000cm2
20cm
the lug nut adapter is located in the trunk with your jack, spare, and lug wrench, if you have taken it to a shop they may have put the adapter in your glove box, its about twice the size of a lug nut.
A meter box is the metal box mounted to the external wall of a home that houses the meters, circuit breakers etc.
Since a meter is 100 centimeters when you divide that by 5 you get 20 centimeters.
Your local gas company provider is responsible for your gas meter box.