1.) 15 °F = ….. °C

1) 15'F= 5/9 × (15-32)
= 5/9 × (-17) = -9,4444'C
2) 20'R= 9/4 × 20 + 32 = 45 + 32 = 77'R
3) 25'K= 4/5 × (25-273)= 4/5 × (-248)
= -198,4'R
4) 30'C= 4/5 × 30 = 24'R
5) 35'F= 5/9 × (35-32) + 273
= 5/9 × 3 + 273 = 5/9 × 276
= 153,333' K