Four rivers and three temples

There are four river in such a way that they are like following -

River Temple River Temple River Temple River

All the rivers are magical, moment a worshiper crosses a river with any number of flowers, it becomes double. (For eg 1 flower becomes 2 flowers, 2 become 4 and so on).

How many minimum number of flowers a worshiper needs to carry from beginning such that he offers equal number of flowers in all the three temples, and he is left with zero flowers at the end of fourth river.

2 Answers (Check Answer ▼)

7 Flowers

I came to this conclude with trail and error method.
I tried 1 flower as opening bal and he donates 1 flower, i came with answer 1 extra left instead of 0.

Then further trying i found the no of flowers he enters with and donates are same the output will also remain same.

But then i tried to have 1 flower more to be donate than no of he enters with.

With this i came to conclusion of minimum 7 flowers.

answer Nov 6, 2014 by Kunal Shah

He must starts with 7 flowers and offers 8 flowers to 1 temple.

answer Nov 6, 2014 by Ankit Bajpai

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In a holy town, three temples sit in a row identical in almost every manner including a holy well in front of them......

In a holy town, three temples sit in a row identical in almost every manner including a holy well in front of them. A pilgrim comes to visit the temples with some flowers in his basket.

At the first temple, he takes some water from the holy well and sprinkles it on the flowers to wash them. To his astonishment, the number of flowers in his basket doubles up. He offers a few of them at the temple and turns back to visit the second temple.

At the second temple, he again takes some water from the holy well and sprinkles it on the flowers to wash them. Again the number of flowers double up in number. He offers some of them at the temple and turns back to visit the third temple.

At the third temple, he repeats the process and the number of flowers doubles up yet again. He offers all the flowers in the third temple.

Now, the pilgrim offered the same number of flowers in all the temples. Can you find out the minimum number of flowers he must have had initially? How many flowers did he offer to god in each of the three temples?