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three fifth of 2,400 student in a certain school are girls.Of the girls, 2/3 are in the elementary, the rest high school. How many are in high school 


Sagot :

3/5 of 2,400 is 1,440. So there are 1,400 girls in the school.

2/3 of the girls are in elementary so 1/3 must be in high school.

1/3 of 1,440 is 480. Therefore, there are 480 girls in high school.