The admission fee at a zoo is $2 for children and $4 for adults. if 1800 people enter the zoo and $6000 is collected, how many adults went to the zoo?

The number of adults is

Step-by-step explanation:

Let

x------> the number of children

y------> the number of adults

we know that

-------> equation A

-------> equation B

Multiply equation A by

--------> ------> equation C

Adds equation B and equation C

x= adult, y = kid

x+y=1800

4x+2y=6000

x=1800-y now put that into the 2nd equation

4(1800-y)+2y=6000

7200-4y+2y=6000

4y-2y=7200-6000

2y=1200

y=600

x=1800-600 = 1200

 so 1200 adults and 600 kids

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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