The average of 6 numbers is 18. If one number is excluded, the average becomes 17. What is the excluded number?
Average of 6 numbers = 18
=> Total sum of the numbers = $$(18\times6)=108$$
Let excluded number = $$x$$
New average = $$\frac{108-x}{5}=17$$
=> $$108-x=17\times5=85$$
=> $$x=108-85=23$$
=> Ans - (B)
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