Shawn's answer to Angela's Primary 5 Maths Fractions Singapore question.
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Explanation: Let’s name the person who left A.
Without A, the average is 68 and with A the average is 70. This means that A pulled the average up by 2. Person A scored 16 points above the average (70) which means that the points will be “given” to the rest. So 16/2=8 person. There are 8 more person beside A. Question ask for in the end so the answer is 8.
Working,
Difference from average —> 86-70=16
Average difference —> 70-68=2
Share between no. of people —> 16/2=8
Without A, the average is 68 and with A the average is 70. This means that A pulled the average up by 2. Person A scored 16 points above the average (70) which means that the points will be “given” to the rest. So 16/2=8 person. There are 8 more person beside A. Question ask for in the end so the answer is 8.
Working,
Difference from average —> 86-70=16
Average difference —> 70-68=2
Share between no. of people —> 16/2=8
Date Posted:
1 month ago
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