Let's solve the following problem:
Alex, Bobby and Victor are wearing green, red and white t-shirts. Alex doesn't wear red clothes. Victor doesn't like either red or green. What color is Bobby's shirt?
Step 1
You need to draw a table in which to successively fill in the information given in the task:
Alex doesn't wear red clothes. (mark with the sign )
Victor doesn't like either red or green. (mark with the sign )

Step 2
Then it should be noted with the sign when a statement is true and with
when it is not true.

Answer:
Bobby - red
Viktor - white
Alex - green
* Math Problems with Data and Table can be found in the course Competitive Mathematics - Level 3