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Mrs Lee     [u][u][u][u][u][u][u]  +  10       }

                                                                    }          76

Daughter  [u]                               + 10      }

 

(7u+10) + (u + 10) = 76

8u + 20 = 76

8u = 56

u = 7

Therefore, Mrs Lee’s daughter is 7 years old now.

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