Question

Altaf picked up two number cards from the four cards shown here. He found that one of the remaining numbers was the sum, and the other was the difference of the two numbers he had picked? Which two numbers did he pick? How did you come to the conclusion? Explain your answer.

Answer 1

Answer:

12345678910111213141516171819120

Answer 2

Answer: The two cards Altaf picked are 2 and (-3).

Step-by-step explanation:

I reached to the conclusion by choosing any two numbers from all four, and then calculating the difference and the sum. I checked the following two numbers :

2 and (-1),

2 and 5,

and,

2 and (-3)

Then I found that the sum of 2 and (-3) = (-1), and the difference = 5