4. There were 123 adults and twice as many children at a funfair. Halfway, an equal
number of adults and children left the funfair. In the end, the number of children
became four times the number of adults at the funfair. How many adults were there
at the funfair in the end?

Explanation:

at the beginning

number of adults   x

number of children y

we have z nb of children and parents leaving

so we can write

y - z = 4 ( x - z)

and y = 2x

so 2x - z = 4x - 4z

3z = 2x

so z = 2x/3 = 2 x 123 /3 = 82

so at the end we have

123 -82 = 41 number of adults

246 -82 = 164 number of children

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hope this you and sorry if i get them wrong, i tried my best.