In a class of 40 children, 40% are girls. How many more girls coming to this class would make this 50%?

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Solution

Total number of children in the class = 40

Number of girls in the class = 40% of 40

Let x girls be added to the class.

∴ Total number of children in the class = 40 + x

Total number of girls in the class = 16 + x

Algebraic form of the problem is:

50% of (40 + x) = 16 + x

Subtracting 2x from both the sides:

Subtracting 40 from both the sides:

Therefore, adding 8 more girls in the class would make the number of girls 50% of the total children in the class.

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