Question

Driving me nuts this one.

The energy saving from recycling 1 glass bottle will power the oven adam uses to cook the turkey for 7.5 minutes. Glass used for recycling costs 5p per Kg
A glass bottle wieghs 500 grams

How much would the recycled glass cost to power the oven for 6 hours?

Answer 1

hmmm let hmm come to think..5£ is a bit too much for some junk glass anyway =) hehee, anyhow. so 5cents then

let us nevermind the price for now, and see how many grams are needed for the 6hours

so 1 bottle (500 grams), gives Adam 7.5 minutes of oven time
how many grams will it be for 6hrs or 6 * 60 = 360 minutes?

$\bf \begin{array}{ccllll} grams&minutes\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 500&7.5\\ x&360 \end{array}\implies \cfrac{500}{x}=\cfrac{7.5}{360} \\\\\\ \textit{that'll give you, }\boxed{?}\textit{ grams of glass for 6hrs}\\\\ \textit{divide by 1000 to make it Kgs}\implies \cfrac{\boxed{?}}{1000}Kgs \\\\\\ \textit{is 5cents per Kgs of glass, so }\cfrac{\boxed{?}}{1000}\cdot 5$

that's how many "p" (pennies? pence? pounds?) will it be for 6hrs of oven time for Adam