Papi Calot prepared his garden to plant potatoes. He planned to plant 7 rows of 18 plants each. But he still has a bit of room left, so he's thinking about adding 15 additional potato plants. How many plants does Papi Calot have to buy? Think carefully first, then make a decision:
Let's first calculate the number of plants that Papi had planned: 7 rows * 18 plants / row = 126 plants. Now let's add the other plants: 126 plants + 15 plants = 141 plants. So Papi has to buy 141 plants. So, the answer is 141.