Answer:
D) 12 adult tickets and 4 child tickets
Explanation:
I did process of elimination
A) 4*4=16
12*2 = 24
16+24=40 is not equal to 56
B) 8*4=32
8*2=16
32+16= 48 is not equal to 56
C) 10*4=40
6*2=12
40+12=52 is not equal to 56
D) 12*4=48
4*2=8
48+8=56 is equal to 56