The sister wrote because if 6 of the drink is 2.99 then 1 drink can possibly can 2
To ring the correct answer she would have to decide 2.99 to 6
And the correct price for each drink is 0.49833333....
The area for a sector of a circle is 
. If our angle is 30 and our radius is 5, that fits in like so: 
. It appears that the first choice is what we want except you forgot to square all the radii.
2parts compost and 10pats potting soil
2/10=1/5 which is 1 to 5 ratio.
He wants to end up with 6 kilograms which is 1 kg compost and 5kg of plotting soil.so he can use 1 kg compost
hope it helps
