Aptitude - Problems on Numbers - Discussion
Discussion Forum : Problems on Numbers - General Questions (Q.No. 5)
5.
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:
Answer: Option
Explanation:
| Let the ten's and unit digit be x and | 8 | respectively. |
| x |
| Then, |  |
10x + | 8 |  |
+ 18 = 10 x | 8 | + x |
| x | x |
10x2 + 8 + 18x = 80 + x2
9x2 + 18x - 72 = 0
x2 + 2x - 8 = 0
(x + 4)(x - 2) = 0
x = 2.
Discussion:
43 comments Page 3 of 5.
Febin said:
1 decade ago
How can solve like this manner 8+18 = 24?
8+18 = 26. It's wrong. The product of the number is 8 not that number.
8+18 = 26. It's wrong. The product of the number is 8 not that number.
(1)
Tamilarasi said:
6 years ago
The two digits are 2, 4.
24+18(add 18),
The answer is 42,
Reverse the 42.
Then the final answer is 24.
24+18(add 18),
The answer is 42,
Reverse the 42.
Then the final answer is 24.
(16)
Sun said:
2 decades ago
We can directly check out the answer through options.
24 + 18 = 42 which gives product 8.
24 + 18 = 42 which gives product 8.
Vijay said:
1 decade ago
Find the least value of * for which 7*5462 is divisible by 9?
Please answer the question.
Please answer the question.
Saradhapriyanka.s said:
2 decades ago
I could not understood your answer, please explain in some other way.
Sumithra devi said:
10 years ago
@Vinod. How x-y=-2 suddenly comes, next step what formula is that?
Abc said:
1 decade ago
Only 24 is the product of 8 in this number. So answer is 24.
Nitika said:
1 decade ago
Above you write 8+18 = 24 but 8+18 is 26 how it is to be 24?
Priya said:
1 decade ago
Why 18 should be added in the option to get the answer?
Srinivas said:
9 years ago
I can't understand. Please explain in a simple way.
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