 
 <translate> After painting the red and blue pebbles, Shawn had a remainder of 40 - 9 - 13 = 18 pebbles. He painted 18 / 3 = 6 pebbles yellow. The difference between the number of blue and yellow pebbles is 13 - 6 = 7. Final answer: 7. <hau> Bayan fentin duwatsu masu launin ja da shuɗi, Shawn yana da ragowar 40 - 9 - 13 = 18 duwatsu. Ya zana 18 / 3 = 6 duwatsu masu launin rawaya. Bambanci tsakanin adadin duwatsu masu launin shuɗi da rawaya shine 13 - 6 = 7. Amsar ƙarshe: 7. 