6 to 5, 12 to 10, 18 to 15, 24 to 20, x to 25
Let's take a look at x/25 ratio, which has to be equal 6/5.

The answer is 30 inches.
To make the equation true, the value of x would be 3.
10 percent of 40 dollars is basically 10 parts out of 100 parts of 40 dollars, which is 4 dollars (0.1(40) = 4). Steve paid 4 dollars in taxes and 44 dollars in total.
6g 300mg - 5g 200mg = 1g 100mg