First distribute -8(6+5n) that would be -48+-40n so 3n-5= -48-40n you want the n's on one side so add 40n to the 3n which is 43n+5=-40 than subtracts 5 from each side and it leaves u with 43n=-45 than u divide
The answer is A. 540
540 divided by 2 = 270
540 divided by 3 = 180
The number 540 is also composite, which is required in your answer.
The other numbers do not end in 0,2,4,6 or 8, which is required to be divided evenly by 2. And only answer choices A. B. and C. can be evenly divided by 3.
15/10 = 18-x/x is the ratio of the larger to the smaller triangle
Cross multiply:
15x = 10(18 - x)
15x = 180 - 10x
25x = 180
x = 7.2
Plug back in to check
15/10 = 1.5
18-7.2/7.2 = 10.8/7.2 = 1.5 :)