Answer:
Step-by-step explanation:
Divide 31 by 40. Since you get .775, you make it a percent and it's 77.5% correct.
You could work backwards. -9+5 = -4. Then, -4-2 = -6.
It was -6°C at 3 p.m.
Hope that helped you.
2/5 in percentage is 40%. Since 5/5 represents 100%, 100 divided by 2/5 is 40. Thus 2/5 is 40%