Answer:
[tex] \boxed{ \tt{187.5g}}[/tex]
Explanation:
[tex]let \: the \: o_m \: be \to \: 1500g\\ let \: the \: h_l: be \to 20s\\ for \: every \: 20s : o_m \: is \: reduced\: by \: \frac{1}{2} \to \\ hence \: after \: 1min \: (60s = three \: 20s) \\ hence \to \\ after \: the \: first \: 20s \: o_m = \frac{1500}{2} = 750g\\ after \: the \: second \: 20s \: o_m = \frac{750}{2} = 375g \\ after \: the \: third \: 20s \: o_m = \frac{375}{2} = 187.5g \\ hence \: after \: a \: minute \: the \: orgial \: sample : \\ \boxed{ \tt{o_m : 1500g \: will \: be \: to \: 187.5g}}[/tex]
