Number of red bricks used is approximately equals to 187.
What is proportion?
" Proportion is the relation between two or more quantities, as one increases other also increases or one decreases other one increases."
According to the question,
Situation 1: Number of red bricks over the number of grey bricks was 5.
, it represents
On every 5 red bricks there are 1 grey brick.
On every 5 + 1 = 6 bricks we have 5 red bricks and 1 grey brick.
Situation 2: Total number of bricks used were 224.
Number of red bricks = 224 × (5 / 6) = 186.67
≈ 187 brick ( number of bricks cannot be in decimals.)
Hence, number of red bricks used is approximately equals to 187.
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