The number of spruces in the forest from oak is – 40%, which means that the rest of the oaks are – 60%;
We will solve by the method of drawing up the proportion;
The equality of two relations is called proportion;
We find the% of oak trees from spruce, which we denote by “x”;
We will take 40% of spruces as 100%, since it is from them that we will count the% of oaks;
40 – 100%;
60 – x%;
The product of the extreme terms of the proportion is equal to the product of its middle terms;
To find the unknown extreme term of the proportion, you need to divide the product of the middle terms of the proportion by the known extreme term;
x = (60 × 100) / 40;
x = 150;
Answer: 150% are oaks from firs.
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