Let's define the variables:

• Let $d$ represent the number of hours Dalvin worked.
• Let $f$ represent the number of hours Fatoumata worked.

Now, let's break down the information provided:

1. Dalvin can iron 10 shirts per hour. So, in $d$ hours, Dalvin will iron $10d$ shirts.
2. Fatoumata can iron 20 shirts per hour. So, in $f$ hours, Fatoumata will iron $20f$ shirts.
3. Dalvin worked twice as many hours as Fatoumata. This gives us the equation $d = 2f$.
4. Together, they ironed a total of 200 shirts. This gives us the equation $10d + 20f = 200$.

System of Equations:

$d = 2f$ $10d + 20f = 200$

This system can be used to determine the number of hours Dalvin and Fatoumata worked.

Would you like to solve this system or get more details on the solution process?

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Related Questions:

1. How many shirts would Dalvin and Fatoumata iron if they both worked for 5 hours?
2. What is the total number of shirts Dalvin would iron if he worked 3 hours more than Fatoumata?
3. If Dalvin worked 6 hours, how many shirts did Fatoumata iron?
4. How many hours would Fatoumata need to work alone to iron 200 shirts?
5. How many total shirts can they iron together in 8 hours?

Tip: When solving systems of equations, substitution is a great method if one variable is already expressed in terms of the other!