Brain teaser for the week 20200912 每周烧次脑
▲Click above to subscribe 点击上方蓝字关注我们▲
Difficulty level: ✮ ✮ ✮ ✮ ✮
In this diagram, where a circle is inscribed in a square and another square is inscribed in the circle, if a side of the larger square is 10, what is the area of the smaller square?
Welcome to try your answer
at the Comment Section!
Answer to be disclosed at our
next episode of brain teaser
答案下期公布
By the New Year's Day, top 3 players
will get a gift from us!
元旦前，年度前三高手将获得神秘礼物！
Answer to the last week 上期答案 Brain teaser for the week 20200905 每周烧次脑
（a）6
You need to use the formula Rate × Time = Distance, that is r × t = d.
For the uphill trip,
r (uphill) × t (uphill) = 1 mile
For the downhill trip,
r (downhill) × t (downhill) = 1 mile
The average rate of the car is the total distance traveled (2 miles) divided by the total time traveled, t (uphill) + t (downhill).
Since the average rate was given as 20 mph, 20 = 2 divided by [t(uphill)+t(downhill)].
Thus, we get 10=t(uphill)+t(downhill).
Contributions will be appreciated！
欢迎投稿！
▲ QQ group
▲ Official account