Question

Rahul and Tina are playing the game of “guess the number”.
Rahul asks Tina, “Think of any number”
Rahul then says, “Multiply that number with 7”
Rahul continues, “Now, subtract 9 from what you get”
Rahul finally asks Tina, “So, tell me what number did you get?”
Tina thinks for a while and says, “19”
Rahul now magically tells Tina what is the original number that Tina thought of.
Can you also correctly predict what is that original number that Tina thought of?

• A. 3
• B. 4
• C. 12
• D. 28

Answer 1

The correct option is B 4

We can find out accurately the number that Tina thought of by framing a linear equation as
$7x-9=19$
By solving the equation, we get x = 4
That means, the number Tina initially thougt was 4.