The ratio of tables x to chairs y in a restaurant is 2 to 7 . The restaurant has a total of 12 tables. How many chairs does it have?

Answer 1

tables / chairs = 2/7

Flip that and you get:

chairs/tables = 7/2

There are 12 tables, so:

chairs/12 = 7/2

Solve for chairs.

Answer 2

x= number of tables

y=number of chairs

Given: x/y = 2/7 and x = 12 tables

Find the number of chairs (y) for x=12 tables?

12/y=2/7 => cross product => 2y=12*7 => y = 12*7/2 = 6*7 = 42 chairs