180 people go bowling the ratio of adults to children is 5: 4. how many adults and how many children went bowling?

100 adults and 80 children

sum the parts of the ratio 5 + 4 = 9 parts

divide 180 by 9 to find 1 part of the ratio

= 20 ← 1 part of the ratio

5 parts = 5 × 20 = 100 ← number of adults

4 parts = 4 × 20 = 80 ← number of children

question:

could we have options?

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.