The mean score in a test of the 10 boys in a class was 15 while the overall mean of the 25 students in the class was 16.2. What was the mean score of the girls?
Vishnu spends ₹5000 in buying 12 tables and some chairs. The cost of one table is ₹50 and that of one chair is ₹40. What is the ratio of the numbers of the chairs to the number of tables purchased?