5:3 means for every 5 apples there are 3 oranges. If the box has 15 apples, the box will have: (15 / 5) * 3 = 9 oranges.

If a guy develops rude behavior around you, It doesn't mean that he likes you. If being rude is his way of hiding the fact that he likes you, then he is an immature person. Wait until he becomes mature enough to behave like a normal person would before considering liking him back.

If you keep cooked rice in the fridge, I would suggest to eat it within 5 days or molds may grow on it.