Given:
The objective is to find the value of the number 28 decreased by 23%.
Consider the required number as x.
The dcrease in 23% of 28 can be represented as,
[tex]\begin{gathered} (1-\frac{23}{100})\cdot28=x \\ (\frac{100-23}{100})\cdot28=x \\ \frac{77}{100}\cdot28=x \\ 0.77\cdot28=x \\ x=21.56 \end{gathered}[/tex]Hence, the number 28 decreased by 23% is 21.56.
