Answer:
x = 10
Step-by-step explanation:
First, distribute:
Next, subtract from both sides:
(multiply by 2 to get common denominator,
)
Next, subtract from both sides:
(multiply by 2 to get common denominator,
)
⇒
Next, multiply both sides by 10:
FInally, divide both sides by -1:
x = 10
This is a units conversion problem: you have time and you want to convert that to money. Any units conversion problem involves multiplication by 1 in various forms. When you are given 7.5 min = 1 bottle = 500g, you know that (500 g)/(7.5 min) = 1 because the numerator and denominator are equal. (Of course, you are aware that 500 g = 0.500 kg.) The idea is to choose the forms of 1 that cause units you don't want to cancel, leaving only the units you do want.
The glass for recycling that would save enough energy to power an oven for 6 hours costs 120p.