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The proportion of students in three classes is 3 : 4 : 5 . If the number of students is increased by 20 in each class, then the proportion changes to 4 : 5 : 6 . What is the initial number of students in the three classes taken together ?

BaTi[Si_(3)O_(9)] is a class of

Class 10 Science (Hindi) | Chapter 2 | अम्ल, क्षार तथा लवण | Important Questions | Quick Revision

Class mark of a particular class is 6.5 and class size is 3, then class interval is: