math
posted by jill .
A choir is singing at a festival. On the first night 12 choir members were absent,so the choir stood in 5 equal rows. On the second night only one member was absent, so they stood in 6 equal rows. the same number of people stood in each row each night. How many members are in the choir?

I hope this helps!
3712=25 5 rows of 5
371=36 6 rows of 6 
from the first data:
it has to be a multiple of 5 + 12, could be
17 22 27 32 37 42 47 ...
from the 2nd data:
it has to be a multiple of 6 + 1 , could be
7 13 19 25 31 37 43 ..
ahhh, 37 is found in both , which is also Lila's answer.
There were 37 choir members
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