Chemical Engineering's Chocolate Christmas puzzle

Hot Chocolate

The elves are busy getting Santa’s sleigh ready for Christmas Eve. Santa always takes hot chocolate with him to keep him going through the night.

It has to be 90% milk and 10% cocoa. The weight of the hot chocolate is 500 grams. The elves had just finished preparing everything but were called away for some urgent gift wrapping. When they returned, the weight of the milk in the hot chocolate was reduced from 90% to 50%.

How much does the hot chocolate weigh now?

Submit your answer below, good luck!

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