Need a hint?
Answer the question as presented.
The difference between the first and second images will give you the height of one brick. You can then work out the height of the bird
For how many bricks, take the height of the bird from 80cm. Then divide this by 5cm (he height of a brick).
One brick is 5cm therefore the bird is 20cm tall. Using this information on the third image to calculate the numbers of bricks (80 - 20)/5 gives 12.
