Answer: After 2 hours of work. The amount will be $21
Step-by-step explanation:
Let h be the amount of hours.
Maryann has $9 saved (m=9) and can earn $6 per hour (6h)
Carlos has $3 saved (c=3) and can earn $9 per hour (9h)
If we add maryann's saved money and the money she can earn per hour and equal it to carlos's, we can calculate the amount of hours.
9+6h=3+9h
Start by subtracting 9
6h=3+9h-9
subtract 9h
6h-9h=3-9
combine like terms;
-3h=-6
divide by 3
h=-6/-3
h=2
To calculate the amount, plug this value into the equation.
9+6h=3+9h
9+6(2)=3+9(2)
3+18=3+18
21=21
