Step-by-step reasoning process: The shadow of Jane is 1.5 / 0.5 = 3 times smaller than her height. The height of the tree is therefore 3 times bigger than the shadow, so it's 3 * 10 = 30 meters tall.
[Q & A] The question is Jane is looking at a tree. At the same time, the tree and Jane are casting shadows - the tree of 10 meters and Jane of 0.5 meters. Jane is 1.5 meters tall. How tall is the tree?
The answer is 30

Step-by-step reasoning process: If Karina is currently 40, and she is twice as old as her brother, then her brother is currently 40 / 2 = 20 years old. If Karina was born in 1970, then her brother was born in 1970 + 20 = 1990.
[Q & A] The question is Karina was born in 1970 and she is currently twice as old as her brother. If her current age is 40, in what year was her brother born?
The answer is 1990

Step-by-step reasoning process: The movie theater made 5 * 32 = $160 in matinee tickets. It made 7 * 40 = $280 in evening tickets. It made 10 * 58 = $580 in opening night tickets. There were 32 + 40 + 58 = 130 customers. Half of the customers bought popcorn, so 130 / 2 = 65 bought popcorn. Thus, the theater made 10 * 65 = $650 from popcorn. Therefore, in all, the theater made 160 + 280 + 580 + 650 = $1670 on Friday night.
[Q & A] The question is A movie theater charges $5 for matinee tickets, $7 for evening tickets, and $10 for opening night tickets. A bucket of popcorn costs $10. On Friday, they had 32 matinee customers, 40 evening customers, and 58 customers for an opening night showing of a movie. If half the customers bought popcorn, how much money in dollars did the theater make on Friday night?
The answer is 1670

Step-by-step reasoning process: Let x be the number of feet in John's pool. 2 * x + 5 = 15. 2x = 10. x = 5.
[Q & A]
The question is John's pool is 5 feet deeper than 2 times Sarah's pool. If John's pool is 15 feet deep, how deep is Sarah's pool?
The answer is 5