The art museum had a total of 224 visitors on tuesday. visitors older than 18 paid $12 for admission. visitors 18 years or younger paid $8 for admission. the museum collected a total of $2,520. how many visitors were 18 or younger?
a.42
b.56
c.182
d.194

224 = x + y can be rewritten as x=224-y

2520 = 12x +8y

substitute top equation into second equation for x

2520 = 12(224-y) + 8y

2520 = 2688-12y+8y

2520 =2688-4y

subtract 2688 from both sides

-168 = -4y

dive both sides by -4

y = -168/-4 = 42

x = 224-42 = 182

182 x 12 = 2184, 42 x 8 =336, 2184 + 336 = 2520

and 182 + 42 = 244

 since y was the 18 and younger y = 42

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

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