We know from our problem that yesterday, the temperature of Felix's town was -4°C; we also know that the coldest day on record for his town was 5 times colder than yesterday's temperature. So, to find the temperature of the coldest day on record in Felix's town, we just need to multiply -4°C by 5:
Coldest temperature = (-4°C)(5)
Coldest temperature = -20°C
We can conclude that the temperature of the coldest day on record in Felix's town was -20°C (negative 20°C).