The average marks scored by 5 students remain unchanged from 70 even when the marks scored by John and Anna are included. If John scored 10 marks more than Anna, find their scores.
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Solution
We take: John′smarks=j Anna′smarks=a Sumofthemarksoftheother5students=S
⟹Average=j+a+S5+2=j+a+S7=70
The average mark was 70 even when John's and Anna's marks were not considered.