Answer:
400 grams (or 0.4 kg) of this cheese would cost £2.68.
Explanation:
Let's write and solve an equation of ratios:
0.4 kg x
------------- = -------------
1.0 kg £6.70
Cross multiplying to solve for x, we get:
0.4(6.70) = x, or
x = £2.68
400 grams (or 0.4 kg) of this cheese would cost £2.68.