In election for class president, sophie received 72 of the 160 votes. what percent of the votes did she receive

45%

Step-by-step explanation:

She receives 72 of a total of 160 votes, so we must find what percentage represents the 72 votes out of 160.

What we know is that the 100% of votes is 160:

votes     percentage

160      →    100%

and we want to know the percentage of 72 votes, which i will call x:

votes     percentage

160      →    100%

72        →      x

to find the x we multiply 100% by 72 and then divide by 160:

%

Sophie received the 45% of the votes.      

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180