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= 4/5 × 50
= 4 × 10
50°C = 40°R
B 50°C = T+273
= 50 + 273
50°C = 323K
C. 20°R = 9/4 × T + 32
= 9/4 × 20 + 32
= 9 × 5 + 32
= 45 + 32
20°R = 77°F