Sunflowers

Sunflowers

The lady of the house planted a rapidly growing sunflower in her garden. Every week it doubles its height. After 12 weeks, the sunflower has already grown to 12 meters. After how many weeks will this sunflower be 6 meters tall?

The sunflower will be 6 meters tall after 11 weeks.

Explanation:
Since the sunflower doubles in height every week, the height in the previous week (week 11) must be half of the height in the current week (week 12). Therefore, if the sunflower is 12 meters tall after 12 weeks, it must have been 6 meters tall after 11 weeks.

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