dijawan kak plase.....

(90°X) - (30°X) / (180°X) - (30°X) = t - (0°C) / (100°C) - (0°C)

60 / 150 = t - (0°C) / 100

t - (0°C) • 150 = 100 • 60

150t - 0 = 6.000
150t = 6.000 + 0
t = 6.000 / 150
t = 40°C