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

Find the value of "?" in the ball picture Riddle below:

Which digit occurred maximum times between the number 1 and 1000?

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

Can you count the number of triangles in the given picture?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?