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Elephants and Geese

Age 14 to 16 Short Challenge Level:

Yesterday, at Ulaanbaatar market, a white elephant cost the same amount as 99 wild geese.
Overnight, the price of a white elephant fell by 10% and the price of a wild goose rose by 10%.
How many wild geese cost the same amount as a white elephant today?

This problem is adapted from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.