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Answer

Since there is equal number of boys and girls, 

There is 1unit of boys and 1unit of girls.

3/4u + (1u – 6) = 29

Solving this equation gives:

7/4u – 6 = 29

7/4u = 35

u =20

Since there are 1u of boys in class, there are 20 boys in class.

Number of boys who do not wear glasses = 1/4 x 20 = 5 boys.

 

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Hope this answers your question. 

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This is a Part Whole question.

  Wear Not Wear Total
Boy 3u 1u 4u
Girl 29 – 3u 6 35 – 3u
Total 29    

4u = 35 – 3u

4u + 3u = 35

7u = 35

1u = 5 boys

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