Ratio, SM-Bank 028 MC

A little athletics club is established in a town.

In the first week, 5 girls and 6 boys joined the club.

In the second week, another 4 boys and some more girls joined the club.

The number of girls in the club was now double the number of boys.

How many girls joined the club in the second week?

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\(B\)

Show Worked Solution

\(\text{1st week}\rightarrow 6\ \text{boys.}\)

\(\text{2nd week }\rightarrow 6+4 = 10\ \text{boys.}\)

\(\text{Total girls in 2nd week.}\)

\(= 2\times 10\)

\(= 20\)

\(\therefore\ \text{Girls joining in 2nd week.}\)

\(= 20-5\)

\(= 15\)

\(\Rightarrow B\)