40°c=....................°R...........°F

C/5 = R/9
40/5 = R/4
R = 40 x 4 / 5
R = 8 x 4
R = 32°


C/5 = F-32/9
40/5 = F-32/9
F-32 = 40 x 9 / 5
F-32 = 8 x 9
F-32 = 72
F = 72 + 32
F = 104

Maaf jika salah.

Bismillahirrahmanirrahim...

=> 40˚C
Reamur = 4/5 x C = 4/5 x 40 = 32˚R
Fahrenheit = 9/5 x C + 32 = 9/5 x 40 = 72 + 32 = 104˚F

Jadi , 40˚ C = 32˚R = 104˚F

Semoga Membantu ^_^