Question

ixth grade > R.10 Equivalent rates 9AF ype the missing number to complete the proportion. 21 kilometers in 2 minutes = kilometers in 8 minutes Submit

Answer 1

84

Step-by-step explanation

Step 1

find the ratio

`\text{ratio}=\frac{21\text{ kilometers}}{2\text{ minutes}}=10.5\text{ kilometers per minute}`

Step 2

let x represents the missing number, the

`\begin{gathered} \text{ratio}=\frac{x\text{ kilometers}}{8\text{ minutes}} \\ \end{gathered}`

as the ratio is the same

`\begin{gathered} 10.5\text{ kilometer per minute= }\frac{x\text{ kilometers}}{8\text{ minutes}} \\ \\ 10.5=(x)/(8) \\ \text{Multiply both sides by 8} \\ 10.5\cdot8=(x)/(8)\cdot8 \\ 84.0=x \end{gathered}`

so, the missing number is 84.

I hope this helps you