Latest general Aptitude Question SOLUTION: A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396. What is

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(#M40000182) GENERAL question Keep an EYE

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.
What is the sum of the three digits?

Asked In general Naveen (13 years ago)

Solved Vadivelan M Read Solution (9)

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Sikandar chouhan  (11 years ago)

There r only 4 prime numbers which can form 3 digit number are: 2,3,5,7
2 & 3 r the only digits whose product can produce a single 3rd digit
as 2*5=10,3*5=15....first two digits must be either 2 or 3 i.e. 22, 23, 32 or 33 which means that there are four possible numbers - 224, 236, 326 and 339. it is also given that the difference between its reverse and itself is 396. Only 236 satisfies this condition
so the number will be 236 and also 632-236=396.

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Vadivelan M  (13 years ago)

11 is the sum of the three digits.
The number is 236. Unit digit(6)=product of other two digits(2*3);2 & 3 are prime.
Difference between its reverse(632) and itself(236) = 396. So answer is 2+3+6=11.

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lilly  (13 years ago)

236

Diff of 396 means First and last digit should differ by 4 and first digit ( prime also) should be a factor of last digit. Prime digits are 2,3,5,7. Only possible combination is 236 which satisfies all conditions.

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Dr.Dipin Singh  (13 years ago)

236 as 632-236= 396 and 2,3 are prime numbers such that 2*3=6

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mohd anas  (13 years ago)

*1 is not a prime number hence 155 is not possible but 236 is the right answer

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Dr.Dipin Singh  (13 years ago)

Number is 236 and sum of digits = 2+3+6=11

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Harmandeep Kaur  (12 years ago)

There r only 4 prime numbers which can form 3 digit number are: 2,3,5,7
2 & 3 r the only digits whose product can produce a single 3rd digit i.e. 6
as 2*5=10,3*5=15....
so the number will be 236 and also 632-236=396.

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mohd anas  (13 years ago)

155:bcoz 551-155=396
236:bcoz 632-236=396
hence answer is 155 or 236

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Sikandar chouhan  (11 years ago)

@mohd Anas...1 is not prime no. dude..

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