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leannamat2106
26.02.2020 •
Mathematics
Four families go to the cinema. the reid family take 2 adults and 2 children for £18 ; the mghee family take 1 senior, 2 adults and 1 child for £18.50; and the griffiths family take 1 senior and 3 adults for £19.50. how much will it cost the Linton family to take 1 senior, 2 adults and 3 children?
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Ответ:
Step-by-step explanation:
Let
x = cost for one adult
y = cost for one child
z = cost for one senior.
The Reid family:
take 2 adults and 2 children and paid
that is
, so
The Mghee family:
take 1 senior, 2 adults and 1 child and paid
that is
, so
The Griffiths family:
take 1 senior and 3 adults and paid
that is
, so
You get the system of three equations:
From the first equation:
From the third equation:
Substitute them into the second equation:
Then
Hence,
the cost for one adult is![\pounds 5](/tpl/images/0524/8690/cbabb.png)
the cost for one child is![\pounds 4](/tpl/images/0524/8690/b1169.png)
the cost for one senior is![\pounds 4.50](/tpl/images/0524/8690/db75f.png)
The Linton family takes 1 senior, 2 adults and 3 children and paid
Ответ:
76 yard is the answer.
Step-by-step explanation:
C=2πr
239.64/3.14=2r
76=2r
and 2r=d