Proofread your questions before you post them.
let childern passs rate is x
then adult pass price will be (x+20)
as adult price is RS. 20 more than the childern pass price
200 childern passes are sold
and 50 adult passes are sold
now total price is 2250
now x = childern
so childern pass price is 5
and adult price is 20 more then the childern
adult price is 25
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