700 g of an alcoholic solution of iodine contains 119 g of iodine. what is the concentration of iodine in the solution?

You need to solve the problem with interest. To do this, we will use the proportioning. Let’s denote by x the percentage of iodine. The entire solution is designated as 100%.
Let’s make the following proportion:
700 g = 100%;

119 g = x%;
Let’s solve this proportion using the diagonal method, multiplying each diagonal with each other:
700 * x = 119 * 100;
Let’s sort this equation by performing the possible multiplication actions:
700 * x = 11900;
Find x:
x = 17%.
Answer: the percentage of iodine in this solution is 17%.