Question: A cake of 400 grams is divided into eight equal parts. Nathalie eats one-eighth of the cake, and Pierre eats double what Nathalie ate. How much did Pierre eat, in grams? Think carefully first, then make a decision:
Nathalie ate 1 / 8 * 400g = 50g of cake. Pierre eats 2 * 50g = 100g of cake. So the answer is 100.