Question

To solve a proportion first the two numbers that are diagonal.

Answer 1

we have

`\begin{gathered} (2100)/(30)=(x)/(45) \\ 30* x=45*2100 \\ 30x=94500 \\ (30x)/(30)=(94500)/(30) \\ x=3150 \end{gathered}`

answer: 3,150 times every 45 minutes