Ten fifths make two wholes.
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10
There are 10 tenths in one whole, so to find out how many tenths make up two wholes, you would multiply 10 tenths by 2 wholes, which equals 20 tenths. Therefore, two wholes consist of 20 tenths.
4/10 is the answer
16
There are 400 metres in two-fifths of a kilometre.