The following pairs of equations are equivalent. describe the operation that occurred in the second equation. 3+9=12 and 3+9-5=12-5

See explanation

Step-by-step explanation:

A. Given the equation

Using the subtraction property of equality (subtracting 5 from both sides of equation), we'll get an equivalent equation

B. Given the equation

Using the addtion property of equality (adding 4 to both sides of equation), we'll get an equivalent equation

C. Given the equation

Using the division property of equality (dividing  both sides of equation by 2), we'll get an equivalent equation

D. Given the equation

Using the multiplication property of equality (multiplying  both sides of equation by 2), we'll get an equivalent equation

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.