x equals 15
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X/10 * 15/25 = 6 x=6
Let's see if they are or no. 6/10 = 15/ 25? Let's suppose that the are proportional. Then,cross multiply: 6 x 25 = 10 x 15 ? 150 = 150 True. Thus 6/10 = 15/25
(6 x 10^12)^2 = 6^2 x (10^12)^2 = 36 x 10^24 = 3.6 x 10^25.
y = x/k so 15 = 6/k making k = 0.4. when x = 10 y = 10/0.4 ie 25 alternatively y/x = k ie 15/6 = k so k = 2.5; y/10 = 2.5 making y = 25.
x-6-x-4=10-x -10=10-x -20=-x x=20 check: 20-6-20-4=10-20 -10=-10√