The easiest way to isolate the variable is to multiply by the reciprocal. This leaves n on the left and 12*(5/3) on the right.
The answer is 20
1- 0.25= 0.75 (multiplier)
33÷0.75=44
The suitcase originally weighed 44kg
Hope this helps!
Assume the original mass,
a=100, then we know
p(t)=0.6*100=60,
h=100,
Substitute into equation and solve for t.
60=100*(1/2)^(t/100)
divide by 100
0.6=(1/2)^(t/100)
take log on both sides
log(0.6)=(t/100)log(1/2)
divide each side by log(1/2)
t/100=log(0.6)/log(0.5)
t=100log(0.6)/log(0.5)
=100(-0.5108)/(-0.6931)
=73.70 days, approximately