Question

Matt paid $55 at a restaurant. That amount included a 10% tip. What was the check amount before the tip? A. $40 B. $43 C. $45 D. $50 E. $52

Answer 1

D $50

Explanation:

50x.10=5

5+50=55

Answer 2

For this case we propose a rule of three:

$ 50 -------------> 100%

x -----------------> 10%

Where the variable "x" represents the amount of the tip.

`x = \frac {10 * 50} {100}\\x = 5`

So, the tip was 5 dollars.

If we subtract that amount to what Matt paid at the restaurant we will have the amount of the check before the tip.
`55-5 = 50`

ANswer:

Option D