智力测试(Intelligence test)
回答下列问题。
91.A 1-metre snake,moving at 1 metre per second,is about to slither(滑行) into a pipe(管道) that is 5 metres long.How long will it take for the snake's entire(整个的) body to emerge(出现) from the other end of the pipe?
92.To add up all the numbers from 1 to 100 would take a while.Can you come up with a way of adding all the numbers together in less than one minute?
93.What do you get if you multiply(乘) all the numbers from 100 down to 0—that is,calculate(计算) 100×99×98×97...×2×1×0?
94.Michelle's mother Sarah offers her daughter a new way of earning pocket money.Michelle can either earn $1 each day for the next 10 days,or take 2 cents on the first day and have her pocket money double each day for the 10 days.Which system will earn Michelle the most money?
95.How can you drop an uncooked egg 10 metres without breaking it?
参考答案：
91.Six seconds.
92.1+100=101;2+99=101;3+98=101.You continue these sums until you reach 50+51=101. So the quick answer is 101×50=5050.
93.Zero.Any number multiplied by zero equals zero.
94.Doubling:This will earn 2 cents on the first day,4 cents on the second and 8 cents on the third.On the tenth day Michelle will get ＄10.24,making her total earnings ＄20.48.The other choice would have earned ＄10.
95.Drop it from a height of 11 metres.It will fall 10 metres but break only after 11 metres!
