Ratio is 13 to 2, if 65 students were smiling how many were frowning

The ratio is saying for every 13 that are smiling, 2 are frowning.

Divide 65 smiling by 13:

65 / 13 = 5

Multiply 5 by 2 frowning = 10 were frowning.

For this case we have the following proportion:

Where:

x: Variable that represents the students who were smiling

y: Variable representing students who were frowning

They tell us that:

So:

10 students were frowning

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.