What is the difference between
-30.7 and -8.5?

-22.2

well, the system told me that i need a 20 words explanqtion so i'. just typing this down to put in more words but how i solved it, is i used a calculator

75 tickets have been sold so far.

step-by-step explanation:

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.