The answer is 210 children tickets were sold . if you multiply the first equation by 7 it would be 7x+7y=2590. then subtract equation 2 from 1 you will have 4x=840 so x=210. Also you can use substitution method.
hi <3
439.612, 439.261, 439.216, 439.126
hope this helps :)
I know u need to add diverse then add again then u will get your answer which is 25