Question

The energy saving from recycling one 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 weighs 500g. How much would the recycled glass cost to power the oven for 6 hours?

Answer 1

Answer energy saving from recycling one bottle will power the oven for 7.5 minutes

a glass bottle weighs 500 g

the cost of recycling glass is 5 p per kg

1 glass bottle weighs - 0.5 kg

therefore cost of recycling one glass bottle is -0.5 kg x 5 p per kg = 2.5 p

so to power the oven for 7.5 minutes - 1 glass bottle is used

6 hours is equivalent to 6 x 60 = 360 minutes

therefore to power for 360 minutes - 1/7.5 x 360 = 48 glass bottles are needed

and the cost for 1 glass bottle is - 2.5 p

therefore for 48 glass bottles cost is - 2.5 p/bottle x 48 bottles = 120 p

1 p is 0.01 dollars

so the cost in dollars is - 120 p x 0.01 dollars/p = $ 1.20

answer is $ 1.20

Answer 2

6 hours=360 minutes
Glass bottles needed to cook for 6 hours=360/7.5
=48
Weight of 48 glass bottles=48x500g
=24000g
=24kg
Price of 24kg of glass=5px24
=120p