Brain Teasers
Evaporation
Mad Ade has left a glass of water on the window ledge in direct sun light. On the first day 1/3 of the water evaporates. On the second day 3/4 of the remainder evaporates. By the end of the second day Mad Ade remembers the glass. How much water is left expressed as a fraction?
Answer
1/6 of the water is left.Hide Answer Show Answer
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Comments
how??
watupchicks. If you really can't work it out, here's how.
On the first day, 1/3 evaporates, so 2/3 is left.
On the second day 3/4 of the remainder, ie 2/3, evaporates.
2/3 = 4/6. 3/4 of 4/6 = 3/6. 4/6 - 3/6 = 1/6.
On the first day, 1/3 evaporates, so 2/3 is left.
On the second day 3/4 of the remainder, ie 2/3, evaporates.
2/3 = 4/6. 3/4 of 4/6 = 3/6. 4/6 - 3/6 = 1/6.
this is basically pure math, and easy math at that.
No teaser here.
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