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?
Answer with step-by-step thinking: Nathalie ate 1 / 8 * 400g = 50g of cake. Pierre eats 2 * 50g = 100g of cake.
So the answer is 100.


Question: Opal won $100.00 betting on a horse race. She put half of her winnings into savings and bet the other half of her winnings. This time, she made a 60% profit and again, put half of her earnings into savings. How much did she put into her savings?
Answer with step-by-step thinking: She won $100.00 and put half into savings so she put 100 / 2 = $50.00 into savings. She won $100.00 and put $50.00 into savings so that leaves 100 - 50 = $50.00 to bet. She bet $50.00 and made a 60% profit so her profit was 50 * .60 = $30.00. The total wins in the second bet are 30 + 50 = $80. She put half of her $80.00 earnings into savings so that's 80 / 2 = $40.00 into savings. She put $50.00 into saving from her 1st bet and $40.00 from her second so she has saved 50 + 40 = $90.00.
So the answer is 90.


Question: Isabelle works in a hotel and runs a bubble bath for each customer who enters the hotel. There are 13 rooms for couples and 14 single rooms. For each bath that is run, Isabelle needs 10ml of bubble bath. If every room is filled to maximum capacity, how much bubble bath, in millilitres, does Isabelle need?
Answer with step-by-step thinking:
In the rooms for couples, there are 13 rooms * 2 people per room = 26 people. So in total, there are 26 people in couples' rooms + 14 people in single rooms = 40 people in the hotel. As each person gets a bubble bath, Isabelle will need a total of 40 baths * 10ml of bubble bath per bath = 400ml of bubble bath.
So the answer is 400.