Hi Here is a question to explain to a 10 year old . I don't know what to do?
In a cafe 1 burger and 2 drinks cost £2.80
Same cafe 2 burgers and 5 drinks cost £6.10
Find cost of 1 burger and 1 drink.
Please explain in a simplyfied way so she can calculate similar questions in an exam coming up
Thanks
Dee
here's how I would try to explain to a 10 year old ...
1 burger and 2 drinks cost £2.80
double that ...
2 burgers and 4 drinks cost £5.60
you also know that 2 burgers and 5 drinks cost £6.10
from the last two statements, one can determine that the extra 1 drink costs £0.50
finally, since 1 burger and 2 drinks cost £2.80, 1 burger costs £1.80
Here is a simpler approach so that a 10 year old can understand it better. As he/she might not understand simultaneneos equations.
Since 1 burger and 2 drinks cost £2.80
Then 2 burger and 4 drinks cost £5.60 ( multiply by 2 )
Since 2 burgers and 5 drinks cost £6.10 is given
We just have to minus £6.10 - £5.60 = £0.50 to get the cost of the drink as 2 burgers and 5 drinks minus 2 burger and 4 drinks = 1 drink
Since we have the cost of the drink we can easily calculate the cost of 1 burger
1 burger and 2 drinks cost £2.80
1 burger + 2(0.50) = 2.80
1 burger = 2.80 - 1.00 = 1.80
Hope it helps.
Hello, Dee!
Here is a visual approach to skeeter's excellent solution.
In a cafe 1 burger and 2 drinks cost $2.80
Same cafe: 2 burgers and 5 drinks cost $6.10
Find cost of 1 burger and 1 drink.
We are told that: . .1]
One burger and two drinks cost 280.
Double the order: . .[2]
Two burgers and four drinks cost 560.
We are also told that: . .[3]
. . Hence: .
Then [1] becomes: .
. . Hence: .
Therefore, a burger costs $1.80 and a drink costs 50