We are asked to fill in the blanks for the expression _(4.8) = 6(5) - (_)
It is clear that since 6(5) is 30, then our expression will be _(4.8) = 30 - (_)
Any multiple of 4.8 must end with zero, so, its coefficient will be at least 5.
5(4.8) = 30 - (_)
24 = 30 - (_)
so, the value in the parenthesis will be 6