Question: Carla is making smoothies. If she uses 500 ml of watermelon puree and 100 ml of cream, how many 150 ml servings can she make?
Answer with step-by-step thinking: First find the total volume of the smoothie mix: 500 ml + 100 ml = 600 ml. Then divide the total volume by the volume per serving to find the number of servings: 600 ml / 150 ml / serving = 4 servings.
So the answer is 4.

Question: Danny brings 3 watermelons to his family picnic. He cuts each watermelon into 10 slices. His sister brings 1 watermelon to the family picnic, and she cuts the watermelon into 15 slices. How many watermelon slices are there in total at the picnic?
Answer with step-by-step thinking: From Danny, there are 3 * 10 = 30 watermelon slices. From his sister, there are 1 * 15 = 15 watermelon slices. There are a total of 30 + 15 = 45 watermelon slices.
So the answer is 45.

Question: A porcelain vase was originally priced at $200 but went on sale for 25% off. If Donna bought the porcelain vase and paid 10% sales tax, how much did she pay in total?
Answer with step-by-step thinking:
Donna got $200 x 25 / 100 = $50 less for the porcelain vase. So, the porcelain vase is now $200 - $50 = $150. Donna has to pay $150 x 10 / 100 = $15 for the sales tax. Therefore, she paid $150 + $15 = $165 in total.
So the answer is 165.