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# Elephants and Geese

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*

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Age 14 to 16

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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?

You can find more short problems, arranged by curriculum topic, in our short problems collection.

If the base of a rectangle is increased by 10% and the area is unchanged, by what percentage is the width decreased by ?