Question 1016984
Do you mean adding the number straight or as a percentage?  It's written as straight.  In that case:
x - 0.3 + 0.4x +2.78 = 25
1.4x +2.48 = 25
1.4x = 22.52
x = 16.086
.
Can you please check to see that this is the correct wording of the problem?  I'm suspecting that one or more of these should be percentages.