脑洞大师 第 193 关：When I was 6 years old, my sister was half of my age and my brother was twice of my age. 5 years later, what is the sum of my siblings' ages?
脑洞大师 第 193 关
通关截图
快速答案
Calculate the siblings' ages 5 years later (sister is 8, brother is 17) to get the sum of 25, then enter '25' and submit.
考察能力
分步解法
- 1) Note your age of 6 as the starting point.
- 2) Work out the sister’s age of 3 and the brother’s age of 12 at that time.
- 3) Add five years to both siblings to get 8 and 17.
- 4) Add 8 plus 17 to get 25, enter it, and submit.
提示
查看提示
Work out each sibling’s age when you were 6 first, then add five years to everyone before you add the two ages.
为什么有效
It is easy to misread the wording and add incorrectly. The clean way is to find both ages at the start, then add the same five years to each person. The sister becomes 8, the brother becomes 17, and their sum is 25.
常见问题
How do I solve Brain Test level 193?
At age 6 your sister is 3 and your brother is 12, so five years later the sum of their ages is 25.
What is the answer to Brain Test level 193?
Enter 25, because the sister is 8 and the brother is 17 five years later, which sums to 25.
Why does my sister start at 3 in Brain Test level 193?
Because 3 is half of your age of 6 when the puzzle begins.
Why does my brother start at 12 in Brain Test level 193?
Because 12 is twice your age of 6, meaning the brother stays 12 years older than you.
How do I avoid the trick in Brain Test level 193?
Do not just double the starting numbers; add five years to everyone before you find the sum of the siblings.
What is the sum asked for in Brain Test level 193?
It is 25, reached by adding the sister’s 8 and the brother’s 17.