There are 15 students in my first period class. If 6 of the students in the class are boys, what percent of the students are boys? A. 60%
B. 25%
C. 40%
D. 30%

C

Step-by-step explanation:

If you were to multiply 15 by 40% it would equal 6.

No. of students in 1st class= 15

No. of boys = 6

Percentage of boys = 6/15 ×100

= 2/3×100

= 40%

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.