Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What Does this text mean:

important=important

Take one out and scratch my head, I am now black but once was red. What am I?

Why is 6 afraid of 7?

What does this rebus puzzle means ?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

What Time Should the last watch show in the below figure?