In one eating house, the round table can seat 9 customers and the oval table can seat 3 customers. During lunch time, all the tables in the eating house were occupied. The number of each type of tables in the eating house is more than 4 and less than 10. If there were 93 customers, find
(a) the number of oval tables
(b) the number of round tables
Oval tables |
Number of customers around oval tables |
Round tables |
Number of customers around round tables |
Total number of customers |
5 |
5 x 3 = 15 |
5 |
5 x 9 = 45 |
15 + 45 = 60 (x) |
6 |
6 x 3 = 18 |
7 |
7 x 9 = 63 |
18 + 63 = 81 (x) |
7 |
7 x 3 = 21 |
8 |
8 x 9 = 72 |
21 + 72 = 93 (✓) |
(a)
Number of oval tables = 7
(b)
Number of round tables = 8
Answer(s): (a) 7; (b) 8