Answer:
16
Explanation:
okay this question looks confusing. but take a look and face on the numbers. you will understand that on the left hand it is adding 12. which make them 12, 24, 36, 48. he add 12 to the first 12 and make 24 and add 12 to 24 and make 36 and add 12 to 36 and make 48. it is the same thing going on the right side he is adding 4 for each. so first you see that the number have 4 gab. this means the difference between 4 and 8 is 4. the difference between 8 and 12 is 4 the difference between 12 and the next unknown number will be also 4. so the answer will be 16.
let me know if you get it right.