A full house

Two large squares and three smaller ones of side length 5 are placed as shown. What is the pink area?

Scroll down for a solution to this problem.


The pink area is 90.

Solution by Jonathan Crownshaw.


A full house
A house to live
A house to play
Feasts and guests every day
All the rooms for work or stay
Secret rooms
And hiding places
The house looks like a shelter
The house is full
And all are there
In this house I feel secure
And where I have my heart


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