Question

$\frac{7}{y} = 0.4$

Explanation:

Step1: Eliminate denominator

Multiply both sides by $y$:
$7 = 0.4y$

Step2: Isolate $y$

Divide both sides by $0.4$:
$y = \frac{7}{0.4}$

Step3: Simplify the fraction

Convert decimal to fraction and simplify:
$y = \frac{7}{\frac{2}{5}} = 7\times\frac{5}{2} = \frac{35}{2}$

Answer:

$\frac{35}{2}$ or $17.5$