A company mixes two types of lawn seed.
Britegreen grass seed costs £18 per kilogram.
Grassgreen grass seed costs £21 per kilogram.
The company mixes the seed in the ratio Britegreen : Grassgreen = 2:3.
a How much Grassgreen will the company need to mix with 15 kg of Britegreen?
b How much Britegreen will the company need to mix with 45 kg of Grassgreen?
c How much will one kilogram of the mixture cost?
