Correct Answer: 861 : 1012

Solution : As per the given bar graph:
The number of females in India in 1961 = 21 crore
The number of males in India in 1961 = 23 crore
R ₁ = $\frac{\text{The number of females in India in 1961}}{\text{The number of males in India in 1961}}× 1000=\frac{21}{23}×1000$
The number of males in India in 1991 = 44 crore
The number of females in India in 1991 = 41 crore
R ₂ = $\frac{\text{The number of males in India in 1961}}{\text{The number of females in India in 1961}}× 1000=\frac{44}{41}×1000$
Required ratio = R ₁ : R ₂
Required ratio = $\frac{21}{23}×1000$ : $\frac{44}{41}×1000$
Required ratio = 861 : 1012
Hence, the correct answer is 861 : 1012.