If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

A man dies of old age on his 25 birthday. How is this possible?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Solve this riddle by finding the odd one out from the rest.

What is the largest number you can write with just 3 digits?

Can you move 2 matchsticks to form four equal sized squares.

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?