An adult's heart beats 2,100 times every 30 minutes. a baby's heart beats 2,600 times every 20 minutes. how many more beats does a baby's heart beat in 60 minutes than an adult's heart?

A baby's heart beats 3600 times more in an hour than an adult's heart.

Step-by-step explanation:

If an adult's heart beats 2,100 times every 30 minutes, it beats 4,200 times every 60 minutes.

If a baby's heart beats 2,600 times every 20 minutes, it beats 7,800 times every hour.

Subtract the adult's heart beats from the baby's heart beats (7,800-4,200) and you'll receive the number of more beats a baby's heart does (7,800-4,200=3,600).

c-4 is the final answer! : )

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.