Answer:
$6
Step-by-step explanation:
so you add 16 15 and 20 to see how much you earned in total, to get 51 dollars. we subtract 12 because we used it at the movies and get 39 dollars in total. now we subtract this from 45 to see how much more we need to get 6.
equation: 45-(15+16+20-12)........this equals 6 as well