Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

Which Travels Faster? Solve below famous picture riddle:

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Count the number of lines in the image below ?

Can you place three balls such that the equation shown in the picture holds true?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

Can you find out the number that should replace the question mark with a valid reason?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?