# Need some help year 10

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• March 25th 2013, 07:56 AM
xninjagirlx
Need some help year 10
Hi i'm really stuck on this question. I tried to look up on youtube etc, but could'nt find anything.
Heres the question:

If 30 or more people are going on a train trip, the cost for "n" people is "\$d"

d calculated using the formula "d= 60(n/4-5)

How much will the train trip cost for 48 people?

Please note I don't need the answer for this even a link to video, on how to do this would be fine. BUT I wouldn't mind a answer as well.(Nerd)
• March 25th 2013, 08:41 AM
joeDIT
Re: Need some help year 10
if $d = 60((n/4)-5)$ then you get the cost, d, for n people by inserting n=48 into $d=60((48/4)-5)$ so you should be able to get d from here :)
• March 25th 2013, 08:56 AM
johnkelly
Re: Need some help year 10
N = number of people so D = 60 ((48/4) - 5) Solve parts in the inner brackets first, 48/4 then minus the 5, multiply that answer by 60.