The admission fee at an amusement park is $2.00 for children and $5.00 for adults. On a certain day, 321 people entered the park, and the admission fees collected totaled 1197 dollars. How many children and
how many adults were admitted?

answer asap

i think it is 18

step-by-step explanation:

2y+y=5

add 2y and y

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."