Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Can you identify the hidden rebus in the image below?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

What four weights can be used to balance from 1 to 30 pounds?

What breaks yet never falls, and what falls yet never breaks?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag