Final answer:
The total weight when you combine 70g of lemonade and 2.5g of sugar is 72.5g.
Step-by-step explanation:
To find the total weight when you combine the 70g of lemonade and the 2.5g of sugar, you simply add the two weights together: 70g + 2.5g = 72.5g. So, the correct answer is 72.5g.
Learn more about Combining weights of substances in Mathematics