How to solve word problems using models and algebra - Singapore Math - Ratio

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In this video we solve a word problem. we use both model method and algebra to solve the given problem. This problem involves Ratio.
Singapore math is an innovative method for teaching math to your kids, as it used model diagrams to demonstrate the concept visually while solving the problem. This video is applicable for Grade4, Grade 5 and Grade 6.

Problem being solved is given below:
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In a club the ratio of the number of adults to the number of children is 12:7. The ratio of the number of boys to girls is 3:2. If there are 42 girls, how many numbers are there altogether?