In a school, 0.9 of the girls and 0.7 of the boys take part in curricular activities. There is an equal number of boys and girls who do not take part in curricular activities. If 374 children take part in curricular activities, how many less children do not take part in curricular activities than those who take part in curricular activities?

Girls		Boys
Take part	Do not take part	Take part	Do not take part
9x3	1x3	7	3
	1x3		1x3
27 u	3 u	7 u	3 u

0.9 = ⁹₁₀
Girls that take part : Girls that do not take part = 9 : 1

0.7 = ⁷₁₀
Boys that take part : Boys that do not take part = 7 : 3

The number of boys who do not take part is repeated.  Make the number of boys who do not take part the same.  LCM of 1 and 3 is 3.

Number of children who take part in curricular activities
= 27 u + 7 u
= 34 u

34 u = 374

1 u = 374 ÷ 34 = 11

Number of children who do not take part in curricular activities
= 3 u + 3 u
= 6 u

Number of less children who do not take part in curricular activities than those who take part in curricular activities
= 34 u - 6 u 
= 28 u
= 28 x 11
= 308

Answer(s): 308