(a) Find the difference between the product of 2.5 and 7.5 and the sum of 2.75 and 9.55.

(b) Solve ${{3x+2}/{3}}-{{3-x}/{8}}={1}/{6}$

(c) A container is 24 m long, 9 m wide and 8 m high. How many books can it hold if each book is 20 cm long, 16 cm wide and 6 cm thick.