Maths problem- HELP! Watch

aieshacaitlin
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I have to pass the maths BKSB for sixth form by next Thursday. Don't know why as I got a B at maths GCSE...
This is the question I keep getting wrong and don't understand:

The energy saving from recycling one glass bottle will power the oven Adam uses cook the turkey for 7.5 minutes.
Glass used for recycling costs 5p per kilogram.
A glass bottle weighs 500 grams.
How much would the recycled glass cost to power the oven for 6 hours?

Thanks 🌻🌻
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sayema1
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ummmm i got the ans 120p idk whether thts correct or not
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Ola2898
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mass of glass bottle = 500x10^-3 kg
time= 6x60 = 360 min
No of glass bottles = 360/7.5= 48 bottles
total mass of bottles = 500x10^-3 x48 = 24 kg
Total cost = 5x24 = 120p = £1.20
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Makkamkoo
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There's nothing to grrr about. 7.5min or 1/8 hour requires 500 g = 0.5 Kg of glass (1 glass) 1 hour requires = 8 x 0.5 = 4 Kg glass 6 hours will require = 6 x 4 = 24 Kg 1 Kg costs = 5p 24 Kg cost = 5 x 24 = 120p
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sayema1
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(Original post by Ola2898)
mass of glass bottle = 500x10^-3 kg
time= 6x60 = 360 min
No of glass bottles = 360/7.5= 48 bottles
total mass of bottles = 500x10^-3 x48 = 24 kg
Total cost = 5x24 = 120p = £1.20
weuu genius i did it in another waay:awesome:
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Ola2898
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(Original post by sayema1)
weuu genius i did it in another waay:awesome:
How did you do it?
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sayema1
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(Original post by Ola2898)
How did you do it?
okay sooo m baad at explainingg smthn :P ihope u cn get it
1kg->1000g
so 5p->1000g
for 500g->x(we hv to find x) so umm cross multiplication nd then u get 2.5p for 500g of glass nd then they mentioned one glass supplies power for 7.5 mins nd the weight of one glass is 500g nd the cost for it is 2.5p i hope yr getting it
and then 6*60=360mins nd then i did 2.5p->7.5min
so 360mins->? cross multiplication agaaaaaaaain nd then u get 120p
:awesome::awesome::awesome:
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Ola2898
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(Original post by sayema1)
okay sooo m baad at explainingg smthn :P ihope u cn get it
1kg->1000g
so 5p->1000g
for 500g->x(we hv to find x) so umm cross multiplication nd then u get 2.5p for 500g of glass nd then they mentioned one glass supplies power for 7.5 mins nd the weight of one glass is 500g nd the cost for it is 2.5p i hope yr getting it
and then 6*60=360mins nd then i did 2.5p->7.5min
so 360mins->? cross multiplication agaaaaaaaain nd then u get 120p
:awesome::awesome::awesome:
dont worry I get it I dont think your that bad at explaining
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sayema1
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(Original post by Ola2898)
dont worry I get it I dont think your that bad at explaining
hehehe thnkss:awesome::awesome::banana2:
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Ola2898
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(Original post by sayema1)
hehehe thnkss:awesome::awesome::banana2:
ur welcome
so what kind of courses do you do
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sayema1
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(Original post by Ola2898)
ur welcome
so what kind of courses do you do
umm biological science:^_^::^_^: u?
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Ola2898
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(Original post by sayema1)
umm biological science:^_^::^_^: u?
im doing a level maths physics and chemistry
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sayema1
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(Original post by Ola2898)
im doing a level maths physics and chemistry
ohh okhay goood i left physics :unimpressed::argh::afraid:annoying nd haardd. biology is way more interestingg
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Ola2898
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(Original post by sayema1)
ohh okhay goood i left physics :unimpressed::argh::afraid:annoying nd haardd. biology is way more interestingg
The problem I have with physics is that I know all the formulas and calculations but the questions in the exam can be very complicated and makes it hard for me to know how to apply the formulas
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sayema1
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(Original post by Ola2898)
The problem I have with physics is that I know all the formulas and calculations but the questions in the exam can be very complicated and makes it hard for me to know how to apply the formulas
yehh ikrr that happened to me as well so i decided not to study physics anymore after my unit1 result for physics:awesome::awesome:
i love astrophysics ONLY
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Makkamkoo
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The problem I have with biology is when we are dissecting organs I am quite squeamish so I never get to see them lessons otherwise I would barf 🤢
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sayema1
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(Original post by Makkamkoo)
The problem I have with biology is when we are dissecting organs I am quite squeamish so I never get to see them lessons otherwise I would barf 🤢
hahaha ikrr but i love watching surgeries onlinee
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Makkamkoo
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(Original post by sayema1)
hahaha ikrr but i love watching surgeries onlinee
i can't even watch that it just makes me ill
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Ola2898
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(Original post by sayema1)
hahaha ikrr but i love watching surgeries onlinee
So are you planning to become a surgeon
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sayema1
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(Original post by Makkamkoo)
i can't even watch that it just makes me ill
hahhaha i hope u never have to get operated with local anesthesia nd watch yr own operation!! :p:::ahee::ahee::ahee:
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