Question

Plz Answer Question No. 3 and 5 Fast.

Answer 1

let the digits be x and y
number is 10x+y
number obtain by reversing digits is 10y+x

7(10x+y)=4(10y+x)
70x+7y=40y+4x
70x-4x=40y-7y
66x=33y
2x=y............1

difference between two digits is 3
x-y=3
x=3+y.............2

2(3+y)=y ..........from 1 and 2
6+2y=y
y=-6

i hope it will help you

Answer 2

Hey mate here is your Answer