In grass, water contains 70% of the total mass, and in hay – 10%. How much grass do you need

In grass, water contains 70% of the total mass, and in hay – 10%. How much grass do you need to cut to make 1 quintal of hay?

To solve the problem, let’s make a proportion in x kg of grass contains 70% water, and in 100 kg (1c = 100 kg) of hay – 10%, the percentages are converted to decimal fractions. To do this, divide the percentage by 100, we get x-0.7; 100-0.1. Let’s solve the proportion: 100 * 0.7: 0.1 = 700kg.
Answer: 7ts