Grapes contain 75% water, and raisins obtained from them contain 20% water.

Grapes contain 75% water, and raisins obtained from them contain 20% water. How many raisins will be obtained from 320 kg of grapes?

Let’s calculate what percentage of the mass the grapes lose due to water:

75% – 20% = 55% – the grapes lose mass due to water.

Let’s calculate how much weight the grapes lose due to water, making up the proportion:

320 kg – 100%,

M – 55%.

We draw up an equation and solve it:

M = 320 * 55: 100;

M = 17600: 100;

M = 176 kg – grapes lose weight due to water.

Let’s calculate how many kilograms of raisins will be obtained from 320 kg of grapes:

320 – 176 = 144 kg – raisins will be obtained from 320 kg of grapes.

Answer: 320 kilograms of grapes will make 144 kilograms of raisins.