Answer:
William's age is 18 years old and Monica's age is 6 years old
Step-by-step explanation:
Let
x ----> William's age
y ----> Monica's age
we know that
x=3y ----> equation A
(x+6)=2(y+6) ----> equation B
Substitute equation A in equation B and solve for y
(3y+6)=2(y+6)
3y+6=2y+12
3y-2y=12-6
y=6 years
Find the value of x
x=3(6)=18 years
therefore
William's age is 18 years old
Monica's age is 6 years old
