Question

19. There were 20 drinks in a cooler.

Answer 1

For this case we have that the complete question is:

There were 20 drinks in a cooler. Joey drank 15% of the drinks. Sandra drank 1/5 of the drinks. Hannah drank 1/4 of the drinks. Tammy drank 30% of the drinks. How many drinks are left in the cooler? a 0 b 2 c 5 d 9

We propose a rule of three:

20 ---------> 100%

x ------------> 15%

Where the variable "x" represents the amount of drinks equivalent to 15%.

$x = \frac {15 * 20} {100}\\x = 3$

So, Joey drank 3 drinks.

On the other hand, we have that Sandra drank $\frac {1} {5}$of the drinks:

$20 * \frac {1} {5} = \frac {20} {5} = 4$

Thus, Sandra drank 4 drinks.

In addition, Hannah drank$\frac {1} {4}$ of the drinks:

$20 * \frac {1} {4} = 5$

So Hannah drank 5 drinks.

Finally, Tammy drank 30% of the drinks:

20 ---------> 100%

y ------------> 30%

Where the variable "y" represents the amount of drinks equivalent to 30%.

$y = \frac {30 * 20} {100}\\y = 6$

So Tammy drank 6 drinks.

Adding up we have:

$3 + 4 + 5 + 6 = 18$

So: $20-18=2$

Thus, 2 drinks remain in the refrigerator.

Answer:

Option B