tolong dijawab dengan caranya ya..

suhu dalam celcius
= 100/(170-20) × (140-20)
= 100/150 × 120
= 80 Celcius

(170-140)/(170-20)=(100-n)/100-0
30/150=(100-n)/100
30*100=150(100-n)
3000=15000-150n
150n=15000-3000
150n=12000
n=12000/150
n=80