Hello! :)
What is the probability of choosing a pen from the first box? It is 5/10 = 1/2.
What is the probability of selecting a crayon from the second box? It is 5/8.
The probability of picking a pen from the first box and a crayon from the second box is 5/8 x 1/2 = 5/16.
Hope this helped and I hope I answered in time!
Good luck!
~ Destiny ^_^