Fact is that the reasons why women don't go into math related fields are cultural, not innate ability. It's prevailing attitudes in society like yours that result in fewer women choosing math related fields.
From a study in Science:
"In more gender-equal societies, girls perform as well as boys in mathematics and much better than them in reading. These findings shed some light on recent trends in girls’educational achievements in the United States, where the math gender gap has been closing over time."
www.kellogg.northwestern.edu/faculty/sapienza/htm/science.pdf
And the best predictor of women's ability to equal men in school in maths is the number is women employed in high paying jobs in a country, from an APA study:
"Gender equity in school enrollment, women’s share of research jobs, and women’s parliamentary representation were the most powerful predictors of cross-national variability in gender gaps in math."
http://psycnet.apa.org/journals/bul/136/1/103/
From a study in Science:
"In more gender-equal societies, girls perform as well as boys in mathematics and much better than them in reading. These findings shed some light on recent trends in girls’educational achievements in the United States, where the math gender gap has been closing over time."
www.kellogg.northwestern.edu/faculty/sapienza/htm/science.pdf
And the best predictor of women's ability to equal men in school in maths is the number is women employed in high paying jobs in a country, from an APA study:
"Gender equity in school enrollment, women’s share of research jobs, and women’s parliamentary representation were the most powerful predictors of cross-national variability in gender gaps in math."
http://psycnet.apa.org/journals/bul/136/1/103/