The correct option is
A 90
Number of sheets in one pack = 18
To find the number of sheets in 5 packs,
we have to multiply 18 with 5.
Let us multiply 5×18 through a tape diagram,
wherein we will add 18 five times in the following manner:
∴ 5×18=90
Hence, there are 90 sheets in 5 packs.