RATIO of students of class A and B = 60 : 70 = 6 : 7Let the number of students in class A = 6And the number of students in class B = 7Let the average of score of class A be x, thenAccording to the question6x + 7 × 57 = (6 + 7) × 63⇒ 6x = 13 × 63 – 7 × 57⇒ 6x = 819 – 399⇒ 6x = 420⇒ x = 420/6 = 70Average SCORES of class A is 70Short Trick: Using allegation methodA B (57)636 : 7Average score of class A = 63 + 7 = 70 "> RATIO of students of class A and B = 60 : 70 = 6 : 7Let the number of students in class A = 6And the number of students in class B = 7Let the average of score of class A be x, thenAccording to the question6x + 7 × 57 = (6 + 7) × 63⇒ 6x = 13 × 63 – 7 × 57⇒ 6x = 819 – 399⇒ 6x = 420⇒ x = 420/6 = 70Average SCORES of class A is 70Short Trick: Using allegation methodA B (57)636 : 7Average score of class A = 63 + 7 = 70 ">
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The number of students in classes A and B are 60 and 70, respectively. The average score in mathematics of students in B is 57 and that of all students in A and B is 63. What is the average score of students in A?

Current Affairs General Awareness in Current Affairs 9 months ago

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RATIO of students of class A and B = 60 : 70 = 6 : 7Let the number of students in class A = 6And the number of students in class B = 7Let the average of score of class A be x, thenAccording to the question6x + 7 × 57 = (6 + 7) × 63⇒ 6x = 13 × 63 – 7 × 57⇒ 6x = 819 – 399⇒ 6x = 420⇒ x = 420/6 = 70Average SCORES of class A is 70Short Trick: Using allegation methodA B (57)636 : 7Average score of class A = 63 + 7 = 70
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Posted on 23 Oct 2024, this text provides information on Current Affairs related to General Awareness in Current Affairs. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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