Question

The average of a b and c is 11 average of cd is 17 average of emf is 20 and average of a and c is 17 find out the average of a b c d e f

Answer 1

According to the question

A + b + c = 11 x 3 = 33 .. ...(1)

C + d + e = 17 x 3 = 51 ......(2)

E + f = 22 x 2 = 44 .......(3)

E + c = 17 x 2 = 34 .... (4)

From the equations 2 and 4 we get

34 + d = 51 or d = 17

Now by adding equations 1, 3 and 5, we get

A + b + c + d + e + f = 33 + 44 + 17 = 94

Average of a,b,c,d,e and f = 94/6

= 47/3 = 15(2/3)