Plz Answer Question No. 3 and 5 Fast.
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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