3
they have 4 pairs of legs
A Spider has Four pairs of legs
Insects have 3 pairs of legs (6)
All insects have three pairs of legs.
4
They have 5 pairs of "legs" (-> 10 legs) [paraeopodes], but only use 6 of them for walking. 2 pairs have little pincers. They also have 5 pairs (-> 10 legs) of swimminglegs [pleopodes]. This gives them 20 legs or 10 pairs out of which they use 6 or 3 pairs for walking.
Arachnods have 4 pairs of legs.
Sorry I can't, there is no such thing as a "cockroah".
It has 7 or 8 legs.But sometimes you see it 5 or 6 because the legs were broken and was cut off.
It has 6 legs in total :)(3 pairs)
it has 3 pairs and 6 legs.
Just two examples: Human = two legs (one pair). Elephant = four legs (two pairs).