secepatnya tolong pake cara !!

b 30
100:2=5
60:5=30
maaf Kalo salah

X = suhu pd termometer
= 60°
X0 = suhu titik tetap bawah termometer
= 0°
Xt = suhu titik tetap atas termometer
= 100°
A = suhu pd termometer
A0 = titik tetap bawah termometer
= 20°
At = suhu titik tetap atas termometer
= 100°
jadi, X-X0 / Xt-X0 = A-A0 / At-A0
60-0 / 100-0 = A-20 / 100-20
60/100 = A-20 / 80
60 x 80 = A-20 x 100
4800 = 100A - 2000
4800+2000 = 100A
6800 = 100A
68° = A
q ktemunya 68°