Answer:
90 g of water should be added and he will make 900 g of solution.
Step-by-step explanation:
Let x g be the amount of salt Ilya add to 810g of water to make 10% solution. Then 810+x g is the amount of new solution. Thus,
810+x - 100%,
x - 10%.
Mathematically,

So 90 g of water should be added and he will make 810+90=900 g of solution.
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No because the more negative the temperature is , the more colder it gets
The fibonacci spiral appears to be in everyday items such as plants to snail shells. It's basically a numbering system.an example of the Fibonacci sequences is it applies the growth of every living things. For example, rose petals have a Fibonacci number of petals.