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Question

There are 42 students in a class and 57 of the students are boys. How many girls are there in the class?


Solution

Number of boys in the class = 57 of the total no. of students
                                           =57 × 42 = 5×427=5×6=30

∴ Number of girls in the class = 42 − 30 = 12

Hence, there are 12 girls in the class.

Mathematics
RS Aggarwal (2017)
Standard VII

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