Question 1030468
Call Clatheria's and Clare's ages NOW, x and y, respectively.
Then we write
x = y + 40
Five years ago
x - 5 = 3(y - 5)
Now substitute and get
y+40 - 5 = 3(y - 5)
y + 35 = 3y - 15
Add 15 and subtract y and get
y + 50 = 3y
2y = 50
y = 25 (Clare) and then
x = y + 40 = 65 (Clatheira)