On earth a person weights 400newtons what is the mass of the person

From this formula

Weight = mass x the acceleration due to gravity

W=mg

Derive the formula to get mass of any object by multiplying both sides by 1/9

(1g)W=mg(1g)
Wg=m

m=Wg

where g as acceleration due to gravity equals to 9.8 ms^−2

Just substitute the given values as follows:

m=400newton9.8meter per second squared

=400kgms−29.8ms−2

m=40.82 kg

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