A shop sells toilet rolls in small packs and big packs. There are k k\,k toilet rolls in a small pack. There are 9 toilet rolls in a big pack. The shop has s s\,s small packs and b b\,b big packs of toilet roll.
Write an expression for the total number of packs of toilet roll the shop has.
Write an expression, in terms of sss, b b\,b and kkk, for the total number of toilet rolls the shop has.
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