Question

A 100mL cup of very sweet tea consists of 90% water and 10% sugar. 20% of the tea is poured out. Then, 80mL of water are added. What percentage of the mixture is now sugar?

Answer 1

this probably wont help but

Explanation:

the tea in the large pitcher will be sweeter than the tea in the small pitcher.Â

There are many ways to draw diagrams of this situation, and many ways to reason about any given diagram. The key is to compare some like quantity between the two pitchers. In this example, we compare the amount of sugar in 2 cups of tea for each pitcher.

In the small pitcher (the top diagram), you can see in the diagram that for every 2 cups of tea, there is 1 teaspoon of sugar. But in the large pitcher (the bottom diagram), you can see that for every 2 cups of tea, there is more than 1 teaspoon of sugar.