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Sex ratio denotes the ratio of males to females in a population. The primary sex ratio is the ratio at the time of conception, secondary sex ratio is the ratio at time of birth, and tertiary sex ratio is the ratio of adult human beings. According to CIA estimates the current world sex ratio at birth is 107 boys to 100 girls. In 2010 the global sex ratio was 986 females to 1000 males, which got further reduced to 984 females to 1000 males in 2011.
No, the math term ratio doesn't mean multiply.
If you mean 15 and 45 then the ratio is: 1 to 3
because school girl uniforms are HAWT.
may be no desire for sex