In a school, the ratio of the number of children in lower primary classes to the number of children in the upper primary classes is 2 : 3; and the ratio of the number of children in the upper primary to the number of children in the secondary classes is 4 : 5. What is ratio of the number of children in lower primary to the number of children in the secondary?

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Solution

Ratio of the number of children in lower primary classes to the number of children in upper primary classes = 2 : 3

_{… (1)}

Ratio of the number of children in upper primary classes to the number of children in secondary classes = 4:5

_{Using (1), we get:}

Thus, the ratio of the number of children in lower primary classes to the number of children in secondary classes is 8:15.

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