Question

Please help!!!!!!!!


If you multiply the four-digit number abcd by 4, the order of digits will be reversed. That is , abcd x 4=dcba. The digits a, b,c and d are all different. Find abcd. That means what numbers are abcd equal to?

Answer 1

Any help?

Answer 2

A must be 1 or 2

Answer 3

and D > A

Answer 4

Show how you found your answer please

Answer 5

maybe we start off like this
4000a+400b+40c+4d=1000d+100c+10b+a

Answer 6

3999a+390b=60c+996d

Answer 7

4d=a

Answer 8

How did you get those numbers? I am confused.

Answer 9

1234 = 1*1000+2*100+3*10+4

Answer 10

The answer is 2178 x 4 = 8712
Click this link to find how to solve this: http://www.100marks.in/forum/f18/abcd-x-4-%3D-dcba-aptitude-question-what-b-c-d-332/

Answer 11

Ok thanks

Answer 12

Given condition is
A B C D
*4
--------
D C B A

Outcome is a 4 digit number, i.e no carry from A when we multiply this by 4
So, Possible values of A = 1 or 2

Now A can't be 1, because in final result A is in unit place and 1 is not possible when we multiply any number by 4
So, A =2

Now we have
2 B C D
*4
---------
D C B 2

Now you can see that D = 8,

2 B C 8
*4
--------
8 C B 2

Now you can see taht no carry must be there when we multiply B with 4, so possible values of B is 1 or 2

Let us consider B =1, i.e
2 1 C 8
*4
---------
8 C 1 2
Now only c = ?, you can use equation

(2000+100+10C+8)*4 = 8000+100C+10+2
40 C = 432-12 = 420

C = 7

So we have A =2, B = 1, C = 7, D = 8

Answer 13

good one :)

Answer 14

Wow

Answer 15

What does i,e stand for?

Answer 16

that is = i.e,

Answer 17

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