The ratio of younger sister's height to father's height is 1:2.
HOW TO FIND RATIO?
Ratio refers to the proportion of something in relation to another.
According to this question, a father's height is double of your younger sister's height. This means that the father's height is times 2 (× 2) of the younger sister's height.
Therefore, the ratio of younger sister's height to father's height is 1:2.
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