What is always in front of you but can’t be seen?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

What kind of tree can you carry in your hand?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What time is it when an elephant sits on a fence?

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

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag