Let's simplify the solution:
A. If Maurice collected 960 stickers:
--> Maurice has 8 parts out of a total of 8 + 5 + 7 = 20 parts.
--> Each part represents [tex]\frac{960}{8} = 120[/tex] stickers.
--> Elle has 5 parts, so she has 5 * 120 = 600 stickers.
--> Justin has 7 parts, so he has 7 * 120 = 840 stickers.
B. If the three children have 1,500 stickers altogether:
--> Each part represents [tex]\frac{1500}{20} = 75[/tex] stickers.
--> Maurice has 8 parts, so he has 8 * 75 = 600 stickers.
--> Elle has 5 parts, so she has 5 * 75 = 375 stickers.
--> Justin has 7 parts, so he has 7 * 75 = 525 stickers.
Therefore:
A. Elle collected 600 stickers and Justin collected 840 stickers.
B. Maurice collected 600 stickers, Elle collected 375 stickers, and Justin collected 525 stickers.
