The average (arithmetic mean) of 5, 10, 15 and x is 20. What is the value of x?
- 10
- 15
- 20
- 50
Explanation
That makes it 4 x 20 to get the total sum which is 80
80=5+10+15+x
80–30=x
50=x
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- 80
- 70
- 76
- None of these
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- Not equal
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- Equal
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