F-32 = 1.8C
add 32 to each side
F = 1.8C +32
20 C
F = 1.8 (20) +32
F = 36+32
F = 68
25C
F = 1.8*25 +32
F = 45+32
F = 77
So 20C to 25C is 68F to 77F
6.5m questions
8.6m answers