A) 45
B) 65
C) 87
D) 67
Correct Answer: A
Solution :
(a): Let "ab" be \[\Rightarrow No=10a+b\] Now \[\frac{10a+b}{10b+a}=\frac{5}{6}\] \[\Rightarrow 60a+6b=50b+5a\] \[\Rightarrow 55a=44b\] \[\Rightarrow 5a=4b\] also, \[b-a=1\] \[\Rightarrow 5a=4\left( a+1 \right)\] \[\Rightarrow a=4\And b=5\] .'. Number =45.You need to login to perform this action.
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