Question

 

 

Answer 1

`(399 xx 45 + 55 xx 399)/(1995 xx 1996 - 1991 xx 1995)`

`= [399xx(45+55)]/[1995xx(1996 - 1991)]`

`= (399xx 100)/(1995 xx 5)`

`= (399xx100)/(399 xx 5 xx 5)`

`= 4`

Answer 2