cassie has a coupon for 30% off the cost of dinner at a local restaurant. with the coupon, she saves $6 on her dinner. what was the original cost of her dinner? explain how you know.

$20.

Step-by-step explanation:

$6 is 30 % of the original cost.  

30% = 0.30 as a decimal fraction.

If the original cost is x dollars then we have the equation:

0.30x =  6

x = 6 / 0.30

= $20.

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

linear pair postulates