Question

7 times a two digit no. =4 times the no. By reversing the order .difference b/w them is 3 then find the no.

Answer 1

let the no. be 10x +y
according to the question
7(10x+y)=4(10y+x)
70x+7y=40x+4y
66x=33y
2x=y...........(1)

difference 
y-x=3
y=x+3.........(putting this in eq 1)
2x=x+3
x=3
and y=6 
so the number is 10(3)+6
36