A) 54
B) 72
C) 56
D) Cannot be determined
Correct Answer: C
Solution :
Let the digit of unit place be x. So, the digit of tens place will be \[(15-x)\]. Now, \[[10(15-x)+x]-[10x+(15-x)]=9\] \[\Rightarrow \] \[150-10x+x-10x-15+x=9\] \[\Rightarrow \] \[135-18x=9\] \[\Rightarrow \] \[18x=126\] \[\Rightarrow \] \[x=7\] Thus, the digits of the number are 7 and 8, So, the product of digits = 56You need to login to perform this action.
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