A recipe for 16 biscuits uses 160 g flour, 160 g sugar, 240 g butter and 200 g oatmeal.

(a)(i) Boris has 350 g oatmeal and plenty of everything else. How many biscuits can he make? [2]

(a)(ii) How much butter is needed for these biscuits? [2]

(b) The dough forms a sphere of volume 1080 cm³. Find its radius. \(V=\tfrac43\pi r^3\). [3]

The dough is rolled into a 20 cm × 30 cm × 1.8 cm cuboid. Circular biscuits have diameter 5 cm.

(c)(i) How many whole biscuits can be cut out as shown? [1]

(c)(ii) Find the leftover dough volume. [3]