My estimate is 90. 20 is small. 150 is big.
A good question, especially since some pens look bigger than others - You are being tricky! I think 40 is too small and 70 is too big.
Wow, as many as that?.. Some must be hiding!
50 is too big and 20 is too small my estimate is 30.
I think there is20
I think it is 29
I think 24 is too small and that 59 is too big my estimate is 45
The answer is 91 felt-tip pens