Question

ABC is similar to JKL

Answer 1

21.6 Inches
Because 10 x 1.8 = 18 and 12 x 1.8 = 21.6

Answer 2

Set up a proportion.

AB/JK = AC/JL

18/10 = x/12

Cross multiply:

10x = 216

Divide by 10

x = 21.6

Hope this helps :)