Aptitude - Problems on Numbers - Discussion
Discussion Forum : Problems on Numbers - General Questions (Q.No. 4)
4.
The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?
Answer: Option
Explanation:
Since the number is greater than the number obtained on reversing the digits, so the ten's digit is greater than the unit's digit.
Let ten's and unit's digits be 2x and x respectively.
Then, (10 x 2x + x) - (10x + 2x) = 36
9x = 36
x = 4.
Required difference = (2x + x) - (2x - x) = 2x = 8.
Discussion:
45 comments Page 4 of 5.
Rajesh jangid said:
10 years ago
Hi can anyone explain when to take 2x and x and when 10x+y-10y-x?
Manu said:
1 decade ago
Why are you taking (10*2x+x) - (10+2x) = 36? Please explain it.
Sravanthi said:
1 decade ago
Hi I can't understand this problem. Any more explnation please.
(1)
Vamsikrishnareddy said:
6 years ago
I am not getting this, please anyone explain me in detail.
Kolkata said:
6 years ago
I am not understanding it, please someone explain me.
(1)
Ranjeet said:
1 decade ago
Mitali: Good Explanation from you, thanks.
Abi said:
7 years ago
Where is the 9 from? Please explain.
Aaff said:
6 years ago
Thank you for the answer @Anusha.
Chitta meher said:
5 years ago
How come 10 here? Please explain.
Sakshi said:
7 years ago
Thanks for the explanation @KCS.
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