the solution is h=10 because you add 9 to each side of the equation.
75 tickets have been sold so far.
in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.
now let's assume the total number of tickets sold be x.
then 60% of x = 45
⇒ x(.6) = 45
by dividing with .6 on both the sides of the equation
⇒ x = 75
therefore 75 tickets have been sold so far.
3,458 ÷ 17