Answer :
7 rows of 10 chairs
10 rows of 7 chairs
14 rows of 5 chairs
5 rows of 14 chairs
10 rows of 7 chairs
14 rows of 5 chairs
5 rows of 14 chairs
-- 2 rows of 35 chairs
-- 5 rows of 14 chairs
-- 7 rows of 10 chairs
-- 10 rows of 7 chairs
-- 14 rows of 5 chairs
-- 5 rows of 14 chairs
-- 7 rows of 10 chairs
-- 10 rows of 7 chairs
-- 14 rows of 5 chairs