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Two of them are not very good at math problems. You can use equations to use equations. Tell me the meaning again.
Suppose xkg. Can be prepared.

1:( 1+50)=4:x

1:5 1=4:x

x=204

Open a clothing store to buy X clothes.

( 1-3/ 10)x-( 1-3/ 10)x×80% = 168

0.7x-0.56x= 168

0. 14x= 168

x= 1200

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