<h1>Can you crack the security code?</h1>

Can you crack the security code and enter the computer?
A different crack the code,only for genius.

A father lock the computer and told his son, if he wanted to play, he had to hack and find the 4-digit  code.

 To help him, he gave him an encrypted note.

The password is a 4 digit ABCD number

The  ABC 3-digit number is divisible exactly 4, 5 and 9.
The equation ΑΒ + Δ = 28

 
Crack the code  is a series of puzzles to turn your mind.
 It's a challenge for genius minds and to solve them you need to have reasoning skills and logical abilities


 It's a hard puzzle , try to solve it  and share with your  friends






You can see the answer below





Answer
Solution
Since ABC is divided exactly by 5, the last digit must be 0 or 5  C=0 or 5
Since ABC is divided exactly by 4, the number BG must be divided by 4.

B=(0.1.2.3.4.5.6.7.8.9)   C=(0,5) 
The last digit cannot be 5   
therefore C = 0

BC=00 10 20 30 40 50 60 70 80 90
 Of these, are divided 4
20 40 60 80


 Since ABC is divided exactly by 9
the sum must be 9

Therefore ABC 

720   540    360   180   

Since  A.B + D = 28

7.2+D=28      D=16  Delete D     
smaller or equal 9

5.4 + D = 28      D=8        AND    ABCD      5408

 3.6 +D =28      D=10   Delete

1.8 + D = 28      D=20   Delete




5408