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

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?

I look at you, you look at me, I raise my right, you raise your left. What am I?

81 x 9 = 801. What must you do to make the this equation true?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Can you solve the maths in the below-given picture equation?

Dwayne Johnson was running away with the loot from a heist in his car along with Vin Diesel. One tire was punctured and he dropped down to replace it. While changing the wheel, he dropped the four nuts that were holding the wheel and they fell into a drain. Vin Diesel gave him an idea using which they were able to drive till the rendezvous point.

What was the idea ?

Next Number in the Series,

5, 16, 49, 104, ?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Complete the table series riddle by finding the number that can replace "??".