Answer:
11/4
Explanation:
I'm attaching a screenshot showing this rule. I'm using letters below that correspond to the screenshot of the rule.
AB x AD = AC x AE
AB = 6 + 3 = 9
AD = 3
AC = 4+x
AE = 4
Substitute and solve.
9 * 3 = 4(4+x)
27 = 16 + 4x
11 = 4x
x = 11/4