3 x+3 y=30 3 x+3 y=9 3 x+3 y=21 3 x+3 y=?

## Step 1: Determine the value of the donkey-like figure<br />### From the first equation, we have three identical donkey-like figures summing to 30. Let the value of each donkey-like figure be $d$. Therefore, $3d = 30$. Solving for $d$, we get $d = \frac{30}{3} = 10$.<br /><br />## Step 2: Determine the value of the duck-like figure<br />### In the second equation, a donkey and two identical duck-like figures sum to 9. We know from Step 1 that the donkey is worth 10. Let the value of each duck-like figure be $u$. Thus, $10 + 2u = 9$. Solving for $u$, we get $2u = 9 - 10 = -1$, so $u = \frac{-1}{2} = -0.5$.<br /><br />## Step 3: Determine the value of the squirrel-like figure<br />### The third equation involves a donkey and two identical squirrel-like figures summing to 21. Using the value of the donkey from Step 1, we have $10 + 2s = 21$, where $s$ is the value of each squirrel-like figure. Solving for $s$, we get $2s = 21 - 10 = 11$, so $s = \frac{11}{2} = 5.5$.<br /><br />## Step 4: Solve for the unknown in the fourth row<br />### The fourth row asks for the sum of two squirrel-like figures. Since each squirrel-like figure is worth 5.5 (from Step 3), the sum is $2 \times 5.5 = 11$.