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4.Average
medium
The average of $7$ consecutive numbers is $20 .$ The largest of these numbers is
Solution
Let number be $x,(x+1),(x+2), \ldots,(x+6)$
$=\frac{1}{7} \times \frac{7}{2}(x+x+6)=x+3$
$x+3=20$
$x=20-3=17$
Largest number $=x+6=17+6=23$
Std 13
Quantitative Aptitude
