Answer :
1) d = (40+65)/2 = 105/2 = 52.5
2) d = 40x+65y
=> 40x+65y = 52.5
Already, d is the half of both the numbers of 40 and 65 which is to be multiplied with x and y.
Now, let x=y=0.5 (half of 1)
=> 40(0.5) + 65(0.5) = 52.5 = d
2) d = 40x+65y
=> 40x+65y = 52.5
Already, d is the half of both the numbers of 40 and 65 which is to be multiplied with x and y.
Now, let x=y=0.5 (half of 1)
=> 40(0.5) + 65(0.5) = 52.5 = d