Answer this question:From his apartment, Kona drives 9 miles to the bakery. From there, he drives 24 miles to his grandmother’s house. From her house, he drives 27 miles straight to his apartment. How many additional miles did Kona drive round trip to the bakery stop, compared to a round trip without the bakery stop?
With the bakery stop, Kona drove a total of 9 + 24 + 27 = 60 miles. Without the bakery stop, Kona drove a total of 27 + 27 = 54 miles. With the bakery stop, Kona drives an additional 60 - 54 = 6 miles.
The answer is 6.

Answer this question:George had $100. He bought a shirt for $24 and he also bought a pair of socks. Then he had $65 left. How much is a pair of socks?
George had $100 - $24 = $76 left after buying a shirt. Since he has $65 left after buying a pair of socks, then a pair of socks costs $76 - $65 = $11.
The answer is 11.

Answer this question:Brian has twice as many tennis balls as Frodo, who has 8 more than Lily. If Lily has 3 tennis balls, how many does Brian have?
Frodo has 8 tennis balls more than Lily (who has 3), so he has 8 + 3 = 11 tennis balls. Brian has twice as many as Frodo, which makes 11 * 2 = 22 tennis balls.
The answer is 22.

Answer this question:Julia bought 3 packs of red balls, 10 packs of yellow balls, and 8 packs of green balls. There were 19 balls in each package. How many balls did Julie buy in all?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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The total number of packages is 3 + 10 + 8 = 21. Julia bought 21 × 19 = 399 balls.
The answer is 399.