After all the conditions you applied from the statement given you will get the original number as 16.08.
What is the algebraic equation?
An algebraic equation is when two expressions are set equal to each other, and at least one variable is included.
Given that, if you subtract 0.3 from a certain number, add 0.4 times the original number to the result and then add another 2.78, you'll get 25.
We need to find the original number.
Let us take the original number as x.
Now, subtract 0.3 from the original number.
That is x-0.3.
0.4 times the original number is 0.4x.
Add 0.4 times the original number to the result.
That is, x-0.3+0.4x=1.4x-0.3
Now, add 2.78 to the result. That is 1.4x-0.3+2.78=1.4x+2.48.
As a result, you'll get 25. That is 1.4x+2.48=25
⇒1.4x=22.52
⇒x=16.08
There, the original number is 16.08.
To learn more about algebraic equations visit:
https://brainly.com/question/953809.
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