Question

Chad and Eric left a 20% tip after having lunch at a restaurant. Chad's lunch cost $10.

Which equation can you use to find x, the cost of Eric's lunch?

Group of answer choices

A) 0.2(x + 10) = 5

B) 0.2x = 10 + 5

C) 0.2x + 5 = 10

D) 0.2x + 10 = 5

Answer 1

The equation used to find x, the cost of Eric's lunch is
`\mathbf{0.2(x+10)=5}`

Option A is correct option.

Explanation:

Chad and Eric left a 20% tip after having lunch at a restaurant.

Cost of Chad Lunch = $10

Let Cost of Eric's lunch = x

So, Total cost of Chad and Eric's Lunch = x+10

Now, they left a 20% tip

it means 20% of total cost of lunch

20% can be written as 0.2

So, 0.2 of total cost of lunch is tip of the meal

We can write: 0.2 of (x+10)

or 0.2(x+10)

Looking at options, considering $5 was the amount of tip, the final equation will be:

`0.2(x+10)=5`

So, the equation used to find x, the cost of Eric's lunch is
`\mathbf{0.2(x+10)=5}`

Option A is correct option.