Boys and girls in a club are in the ratio $2 : 8$ . If the club has $40$ members, how many are girls?

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Boys and girls in a club are in the ratio $6 : 3$ . If the club has $45$ members, how many are girls?
Boys and girls in a club are in the ratio $6 : 5$ . If the club has $99$ members, how many are girls?
Boys and girls in a club are in the ratio $3 : 5$ . If the club has $48$ members, how many are girls?
The ratio of $x$ to $y$ is $3 : 4$ . If $12$ is added to $x$ and $4$ is subtracted from $y$ , the new ratio of $x$ to $y$ is $3 : 2$ . What is the…
A cyclist rides the first $\frac{1}{4}$ of a trip at $20$ km/h and the remaining $\frac{3}{4}$ at $30$ km/h. What is the average speed for the whole…
Alloy X is $60%$ copper and $40%$ tin by mass. Alloy Y is $20%$ copper and $80%$ tin by mass. How many kilograms of X must be melted wit…

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