Question

the average age of 3 sisters is 15. if the age of 2 sisters are 12 and 15 the age of 3rd sister is​

Answer 1

Age of 3rd Sister = 3(15) - ( 12 + 15 )

= 45 - 27 = 18

• Age of 3rd Sister is 18

Answer 2

Answer:

The average age of three sisters is 15. The age of two sisters is 12 and 15. What is the age of the third sister?

You're apparently having trouble in math and trying to get a quick, easy answer. Well, I'm not going to give it to you. I will, however, try to help.

If the average is 15 and there are 3 numbers that contribute to the average, then you must multiply 15 by 3. That equals 45.

Since the values of 2 of those contributing numbers are 12 and 15, then you must subtract those from the ‘45’ to find the value of the remaining number.

ANSWER

Average of 3 sister =15

3rd sister age is 18 years