i need the answer. (will give brainliest)

Answer:
6
Step-by-step explanation:
We can use ratios to solve
15 ft 18ft
---------- = -----------
5ft x
Using cross products
15x = 5*18
15x = 90
Divide by 15
15x/15 = 90/15
x =6
Answer:
the ans is 6
Step-by-step explanation:
bcz if u divide 15 by 3 =5 and 12by 3 =4 &18 by 3 =6