Simplified 20/24 would be 5/6 because we divide by 4.
Simplified 12/28 would be 3/7 because we divide by 4.
Its simply 87 + 30, which equals 117.
This is the 2nd time I've posted this answer... not sure why it didn't go through the first time. Let me know if you have questions. :)
Answer:
x = 21
Step-by-step explanation:
corresponding sides in similar polygons are proportional:
set a proportion: BC/FK = CA/KJ => 18/6 = x/7 => x = 18 × 7 ÷ 6 = 21