Carla and Rob left a 20 percent tip after having lunch at a restaurant. The amount of the tip was 6$. Carla's lunch cost $15. Write an equation you can use to find x, the cost of Robs lunch.

Rob lunch costs $15 and an equation that can be used to compute it is x = y - 15, where y is the total amount of the bill minus the tip, that is y = 6/0.2

Step-by-step explanation:

In order to solve this question we can attribute a variable to the total amount spent on this lunch, we'll call it "y". The problem states that a 20% tip was given after lunch and that this value was $6. From this information we can calculate the value of "y". We have:

20%*y = 6

(20/100)*y = 6

0.2*y = 6

y = 6/0.2 = $30

Then the problem tells us that Carla's lunch was $15, so we can calculate the value that Rob spent that will be:

x = 30 - 15 = $15

An equation that can be used to find Rob's lunch value is:

x = y - 15

Since we know that y = 6/0.2 we have:

x = 6/0.2 -15 = 30 - 15

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step-by-step explanation:

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.