Question

When mushrooms are dried, they lose 80 percent of their mass. What weight of mushrooms must be picked to get 1 kg of dry mushrooms?

Answer 1

.20x = 1

Answer 2

In dry mushrooms there are 0.2kg of water and 0.8kg of mushroom because 20% of 1kg is 0.2kg and 80% of 1kg is 0.8kg.
In dried mushrooms 0.8kg is 20% and the water (w) is 80%.
To find w we multiply 0.8kg by 4 to get 3.2kg. To find the total weight of the mushrooms we must add 0.8kg to 3.2kg and we will get 4kg.
Answer: 4kg

Answer 3

5kg.
Explanation: this problem can be done using guess and check method do 80% of 1 then 80% of 2 and so on. I got the answer of 5.