Gerry Lim's answer to Guo Yi's Primary 6 Maths Algebra Singapore question.
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Let n be the number of men at the start.
Total score of all men = 70*n
After 1 extra man joined with score of 50,
Total score of all men = 70*n + 50
Total number of men now = n+1
Average score of all men now = (70*n +50)/(n+1) = 68.
70*n + 50 = 68*n + 68
Solve for n
Total score of all men = 70*n
After 1 extra man joined with score of 50,
Total score of all men = 70*n + 50
Total number of men now = n+1
Average score of all men now = (70*n +50)/(n+1) = 68.
70*n + 50 = 68*n + 68
Solve for n
Date Posted:
2 years ago
Hi. Is there any other method of solving this question? Like different ways of answering? Thanks . So . Much.
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