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विद्यालय में बच्चों की संख्या =51×100/15=340
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let the total number of children in school=X
then no of students in class 6=15/100×x
A/q. 3x/20=51
X=51×20/3
X=340 student
then no of students in class 6=15/100×x
A/q. 3x/20=51
X=51×20/3
X=340 student
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