 
 <prompt> Julia buy 3 packs of red balls, 10 packs of yellow balls, and 8 packs of green balls. Each pack get 19 balls. How many balls Julia buy altogether? <response>: ```The total number of packages na 3 + 10 + 8 = 21.
Julia buy 21 × 19 = 399 balls.

Answer na 399.``` 