Question

The temperature of an oven went from 320° to 280°.

What was the percent decrease in temperature?

A. 1.43%

B. 12.5%

C. 1.25%

D. 14.3%

Answer 1

What is the change from 320 to 280 ?

Answer 2

let's say 320 being the 100% of the temperature
so the difference in temperature, would be the difference between the values
so it went from 320 to 280, so the value difference would be 320-280
\(\large \begin{array}{ccllll}
value&percentage
\\\hline\\
320&100\\
320-280&x
\end{array}\implies \cfrac{320}{320-280}=\cfrac{100}{x}\)

Answer 3

I got it.Thanks!