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Haikai had 450 * 60/100 = 270 square stickers and (450 – 270 ) = 180 circle stickers.

If he gave away u square stickers, he was left with (270 – u) square stickers and the total number of stickers was ( 450 – u)

( 450 – u)* 40/100 = 270 – u     

( 450 – u)* 2/5 = 270 – u         multiply both sides by 5

900 – 2u = 1350 – 5u

3u = 450

u = 150

270- 150 = 120

He had 120 square stickers in the end. 

 

check: 120/( 450 – 150) = 120/300 = 2/5 = 40% checked. 

 

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