In a class there are $20$ girls and $30$ boys, then
Boys : Girls $=$ _______ $[3 : 2 / 2 : 3]$

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Solution

Given that,
Number of boys in the class $= 30$
Number of girls in the class $= 20$
Ratio of number of boys to number of girls $= 30 : 20$
Lowest form of $30 : 20 = \frac{30}{20} = \frac{3}{2} = 3 : 2$ ( Divide both $30$ and $20$ by their HCF $10$ )
Hence, Boys : Girls $= 3 : 2$

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