John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

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?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Can you solve the photo plexer logic ?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?