78a
*
9b
=
73790
find a,b

Dear Student,

Please find below the solution to the asked query:

We have :  78 a $\times$ 9 b  = 73790

Here we can see that unit digit is ' 0 '  , So 

we can take a  =  2 , 4  or 8  If we take b  = 5

Or

If we take a  = 5  and  b  =  2 , 4 or  8

Now we use hit and trial method by taking different combinations ,

Case I  : we take a  = 2 and b  = 5  then

782 $\times$ 95 = 74290   ( Not verified )

Case I we take a = 5  and b  = 4 then ,

785 $\times$ 94 = 73790    ( Verified )

Therefore,

a = 5  and b  = 4                                      ( Ans )


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