A) 43
B) 52
C) 61
D) Data are insufficient
Correct Answer: B
Solution :
Let the units digit of a two digit number = x Tens digit \[=7-x\] Two digit number \[=10(7-x)+x\] \[=~70-9x\] other number \[=10x+(7-x+1)\] \[=\,\,\,9x+8\] \[\therefore \,\,\left( 70-9x \right)\times \frac{1}{2}=9x+8\] \[\Rightarrow \,\,\,x=2\] \[\therefore \] Two digit number \[=70-9\times 2=\] .You need to login to perform this action.
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