[Question]Zhang is twice as old as Li. Li is 12 years old. Zhang's brother Jung is 2 years older than Zhang. How old is Jung?
[Answer]Zhang is 2 * 12 years old = 24 years old. Jung is 2 years + 24 years = 26 years old. The answer is 26.
Q: Ines had $20 in her purse. She bought 3 pounds of peaches, which are $2 per pound at the local farmers’ market. How much did she have left?
A: Ines bought 3 pounds of peaches for 3 peaches * $2 / peach = $6. Ines has $20 - $6 = $14 left. The answer is 14.
Question: A certain tree was 100 meters tall at the end of 2017. It will grow 10% more than its previous height each year. How long has the tree grown from 2017 until the end of 2019?
Answer: At the end of 2018, the tree will grow 100 x 10 / 100 = 10 meters more. Thus, its height at the end of 2018 is 100 + 10 = 110 meters. At the end of 2019, the tree will grow 110 x 10 / 100 = 11 meters more. So, its height at the end of 2019 is 110 + 11 = 121 meters. Therefore, the tree has grown 121 - 100 = 21 meters. The answer is 21.
[Question]In a glee club, there are two times as many female than male members. How many female members are there if there are 18 members in the club?
[Answer]The club has a female group which has twice as many members as the male group, so there are 2 + 1 = 3 groups in the club. There are 18 members in the club, which means there are 18 / 3 = 6 members per group. Since the number of female members consists of two groups, then there are 6 * 2 = 12 female members in the club. The answer is 12.
Q: The lifespan of a hamster is 6 years less than that of a bat. The lifespan of a frog is 4 times that of a hamster. Altogether, the lifespan of the animals is 30 years. What is the lifespan of the bat?
A: Let’s set up an equation by calling the lifespan of a bat x, and therefore the lifespan of the hamster x – 6, and the lifespan of the frog 4 (x – 6) which add together to equal 30, like this: x + x – 6 + 4 (x – 6) = 30. That gives us 6x – 30 = 30 and we should add 30 to each side to try to isolate the x. Now we have 6x = 60, which we will divide by 6, 6x / 6 = 60 / 6. This gives us x = 10. The bat has a lifespan of 10 years. The answer is 10.
Question: James burned his hand in a freak accident. It takes him 4 weeks to heal enough to get a skin graft. After that it takes him 50% longer than that to heal from the skin graft. How long did he take to recover from everything?
Answer:
The skin graft took 4 * .5 = 2 weeks longer to recover from than the previous. So that means it took 4 + 2 = 6 weeks to recover from it. That means he took 4 + 6 = 10 weeks to recover from everything. The answer is 10.