Harry needs 21 square meters of fabric for every 6 wizard cloaks he makes.

Answer:
next to the seven would be 2 and before the 4 would be 14
Step-by-step explanation
Find how much fabric it takes to make one cloak, 21/6=3.5
To find the answer in the second row you see how many times that amount of fabric goes into 7. 7/3.5=2
To find the answer to the third row multiply the amount of fabric it takes to make one cloak, 3.5, by 4, the amount of cloaks. 3.5x4=14