Question

if the average of a,b,c,d and e is 95 and the average of a,b and e is 100. the average of c and b is:

Answer 1

a,b,c,d and e is average of 95 and ave of a,d,e is 100 that average of c and b is 87.50

Answer 2

a+b+c+d+e=95×5
a+b+c+d+e=475
but a+b+c=100×3
a+b+e=300
now 300+c+d=475
c+d=475-300
c+d=175
c+d/2=87.5