Answer:## Step 1: Determine the total amount of land Mang Carlos hasMang Carlos has 10.5 hectares of land.## Step 2: Determine the amount of land each son will receiveEach son will receive 1.5 hectares of land.## Step 3: Calculate the number of sonsTo calculate the number of sons, divide the total amount of land by the amount of land each son will receive.Number of sons = Total land / Land per son= 10.5 hectares / 1.5 hectares= 7The final answer is: $\boxed{7}$