Question 818743

Let :
y = age of Ana
y-9 = age of Michelle

Given:

sum of their ages is 31.

Solution:

age of Ana + age of Michelle = 31

y + (y-9) = 31

y + y -9 = 31

2y -9 = 31

2y = 31 + 9
2y = 40
2y/2 = 40/2

y= 20 age of Ana

Age of michelle = y -9
Age of michelle = 20 -9

Age of michelle = 11

Final Answer:

Age of Ana = 20

Age of Michelle = 11