40X - 20x = 20(
blank-blank)

x=1

or

Step-by-step explanation:

if the question says 40 times negative 20x equals 20 the answer is

if the question is 40x minus 20x equals 20 then the answer is x=1

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.