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Answer

If Lina sold u cookies, she sold ( 52 – u ) muffins.

1.8u + 2.6( 52 – u) = 117.6

1.8u + 135.2 – 2.6u = 117.6           

135.2 – 0.8u = 117.6                   add ( 0.8u- 117.6) on  both sides

0.8u = 17.6

u = 22

So Lina sold 22 cookies.

 

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