The perimeter of a square is equal to that of a rectangle 10 cm long and 6 cm wide. What is the area of a square? What is the area of a rectangle?

The perimeter of a square is equal to that of a rectangle 10 cm long and 6 cm wide. What is the area of a square? What is the area of a rectangle?

Rectangle perimeter (10 + 6) * 2 = 32
So the side length of a square is 32 / 4 = 8
Square area 8 * 8 = 64 rectangular area 10 * 6 = 60

How many hats are there in a wooden box? They are all red except two. They are all blue except two. They are all yellow except two. How many hats are there in the box

Let n be the top in total and X, y and Z be the top in red, yellow and blue respectively
Then: n-2 = x n-2 = y n-2 = Z
X+Y+Z=N
Add formula 1,2,3 to get x + y + Z = 3n-6
The formula is 3n-6 = n
So n = 3
There are three hats in all