If the average of 7, 13, p and q is 17, what is the average of (p+11) and (q-9)?
সমাধান
সঠিক উত্তর: Option B
(7+13+p+q)/4= 17
or, p+q = 68 - 7-13
or, p+q = 48
Thus, the average of (p+11) and (q-9) is:
[(p+11) + (q-9)]/2
= [p+11+q-9]/2
= [p+q+11-9]/2
= [p+q+2]/2
= [48+2]/2
=50/2
= 25
