SOLUTION: The average of two numbers is 15. If one number is subtracted from twice the other number, the result is 21. Find the numbers.

Question 890156: The average of two numbers is 15. If one number is subtracted from twice the other number, the result is 21. Find the numbers.
Found 2 solutions by alexlove054@gmail.com, MathTherapy:
Answer by alexlove054@gmail.com(10) (Show Source): You can put this solution on YOUR website!
let the two numbers be x and y
(x y)/2=15.....1
x-2y=21.....2
from.equation 1 equate both sides
x y=2times 15
x y=30
from equation 2 make x the subject of the formula
x=21 2y....3
put x in equation 2
21 2y y=30
21 3y=30
collect like terms
3y=30-21
3y=9
divide both sides by 3
y=3
put y in equation 3
x=21 2(3)
x=27

Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!

The average of two numbers is 15. If one number is subtracted from twice the other number, the result is 21. Find the numbers.

Numbers are: and
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