An elevator in a tall building starts at the floor of the building that is 90 meters above ground. the elevator descends 2 meters every 0.5 seconds in 6 seconds

it descended 24 meters in 6 seconds as 0.5 is half of a second so it descends 4 meters in 1 second 4*6 = 24 so it is now 66 meters above the ground

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.