p, q, r, s, t, are five numbers such that the average of p,q and r is 5 and that of s and t is 10. What is the average of all the five numbers ?
A. 7.75
B. 7.5
C. 7
D. 5
A. 7.75
B. 7.5
C. 7
D. 5
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Correct Answer – C
According to question `p+q+r=5xx3=15″ …(i)”`
`s+t=10xx2=20″ …(ii)”`
From equations (i) and (ii), p+q+r+s+t=15+20=35
Average p,q,r,s and `t=(35)/(5)=7`