100° C= °R 104° F= °R

100 C= 4/5×100= 80R
104 F= 4/9×(104-32)=4/9×72=32R

4/5 × 100°c = 4×20
= 80°R

4/9 × 104°F-32 = 4/9×72
= 4×8 = 32°F

Semoga Bermanfaat!