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OTP to be sent to Change
W/Wi = (1/2)T/t (t = half life & T is time , Wi = 10gms)
after 540 days
W/Wi = (1/2)540/270 = (1/2)2 =1/4
W = Wi /4 = 10/4 = 2.5grams
approve my ans if u like
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