80°C=...°R 80°C=...°K 80°C=...°R

[tex] {80}^{o} c = ...r \\ \frac{4}{5} \times 80 = {64}^{o} r \\ \\ {80}^{o} c = ...k \\ k = 80 + 27 \\ = {353}^{o} k \\ \\ {80}^{o} c = ...r \\ \frac{4}{5} \times 80 = {64}^{o} r[/tex]
maaf kalau salah

80°c=...°R
t°r=[tex] \frac{4}{5} \div t[/tex]°c
[tex] \frac{4}{5} \times 80 = 64[/tex]°r

80°c=..°k
t°k= t°c+273
=80+273
=353°k
semoga membantu dan benar