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
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.