Answer:
3 Because there are only three bells that aren't being run there for three additional ways that the bells could be rung
6.40x+9.90(154-x)=1230.90
Solve for x
X=84 for child
154-84=70 for adults
When there is only one number repeating, put it over 9
0.8 repeating is 8/9
if there was 2 numbers repeating (.232323), u would put it over 99....23/99
if there was 3 numbers repeating (.234234234), u would put it over 999...234/999
