You need to use the Newton's second law of motion such that:
`F = m*a `
You need to substitute g for a such that:
`F = m*g => m = F/g`
Since the problem provides the value of the force and considering `g = 9.8 m/s^2` yields:
`m = 164/9.8 => m = 16.73 Kg`
Hence, evaluating the mass of the object under the given conditions yields `m = 16.73 Kg` .