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Question
primary 5 | Maths
| Whole Numbers
3 Answers Below
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Date Posted: 11 months ago
Views: 195
He and 7 friends
His score + 8 = average 90
His score +1 +2 +3 +4 +5 +6 +7 +8
His score - 8 = average 88
-8 - 7 -6 -5 -4 -3 -2 -1 his score
-8 - 7 -6 -5 -4 -3 -2 -1 +1 +2 +3 +4 +5 +6 +7 +8
Different in his score = 16
Different in average = 90 - 88 = 2
Therefore, number if pupils = 16÷2 =8
So, James have 7 friends.
His score +1 +2 +3 +4 +5 +6 +7 +8
His score - 8 = average 88
-8 - 7 -6 -5 -4 -3 -2 -1 his score
-8 - 7 -6 -5 -4 -3 -2 -1 +1 +2 +3 +4 +5 +6 +7 +8
Different in his score = 16
Different in average = 90 - 88 = 2
Therefore, number if pupils = 16÷2 =8
So, James have 7 friends.
concept
total unchanged
average diff
=90-88 = 2
condition change diff
8+8 = 16
16÷2 = 8
8-1 = 7 (Ans)
total unchanged
average diff
=90-88 = 2
condition change diff
8+8 = 16
16÷2 = 8
8-1 = 7 (Ans)
See 3 Answers
same question type
https://ask.manytutors.com/questions/103987
https://ask.manytutors.com/questions/103987
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Date Posted:
11 months ago
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