How many grams of 98% sulfuric acid and how many milliliters of water are needed to prepare 1000 grams of 20% sulfuric acid solution (the density of water is 1g / ml)

The density of 98% sulfuric acid is 1.84g/cm and 179. Suppose that the concentrated sulfuric acid with 98% mass fraction of solute is x ml. according to the mass conservation of sulfuric acid, the equation is as follows: 1000 * 20% = x * 98%. The solution is x ≈ 204.08g, and the water to be added is 1000-204.08 = 795.82g, because the density of water is 1g / ml

Mother put 50g fruit treasure into 500g water to make juice. What's the percentage of water

Which child asked?
Guozhen is one tenth of water
Guozhen is 1 / 11 of juice

1. Mother put 10 grams of fruit treasure into 100 grams of water to make juice. How much of the water is fruit treasure? How much of the juice is fruit treasure?
2. Xiaoli folded 40 paper cranes, 13 of which were red, and the rest were yellow. What percentage of the total was yellow?

Guozhen is one tenth of water and one eleventh of juice
The yellow one is 40-13 = 27, and the yellow one accounts for 27 / 40 of the total

Mother put 50g fruit treasure into 500g water to make juice. How much of the juice is fruit treasure

Attention: juice,
Juice = water + fruit
therefore
Fruit treasure accounts for (500 + 50) of the juice, 50 = 1 / 11

How many grams of 98% sulfuric acid and how many milliliters of water are needed to prepare 1000 grams of 20% sulfuric acid solution (the density of water is 1g / ml)