The ratio of tables and chairs in a room is 7 : 9. If there are 560 tables and chairs in the room, then what is the number of chairs ?

397 315 463 489

315

Here, Table : Chair  7      :   9 ⇒ (7 + 9) units = 560 ⇒ 16 units = 560 ⇒ 1 unit = 35 ⇒ No. of chairs = 9 x 35 = 315.