Chapter 2 - Equations, Inequalities, and Problem Solving - 2.4 Applications with Percent - 2.4 Exercise Set - Page 109: 50

$4$

Typical percentage problem: What percent ($n$, as a decimal number) of (the base amount $y)$ is $x?$ Translated:$\quad n\cdot y=x$ --- Here, reworded, $ 175\%$ of ($y=?$) is ($x=7$)$?$ Translated:$\quad 1.75\cdot y=7$ ($ 175\%$ converted to decimal notation is $1.75)$ ... divide the last equation with $1.75$ $y=\displaystyle \frac{7}{1.75}=4$