Question

A study show that there are 16 vehicles for every 10 households how many vehicles are there for 107 million households

Answer 1

`\bf \begin{array}{ccll} vehicles&households\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 16&10\\ v&107E6 \end{array}\implies \cfrac{16}{v}=\cfrac{10}{17E6}\implies \cfrac{17E6\cdot 16}{10}=v`

just to clarify the engineering notation, E6 is just 1 and 6 zeros, or a million, thus, 107,000,000 is just 107E6.