Total weight of 7 experiments = 53.735 × 7 = 376.145 gm
Total weight of first three = 54.005 × 3 = 162.015 gm
The average of the 6th and 7th was 0.010 gm less than that of the first three.
∴ Average of the 6th and 7th = 54.005 – 0.010 = 53.995 gm
∴ Total of the 6th and 7th = 53.995 × 2 = 107.990 gm
Thus, total of 4th and 5th = 376.145 – (162.015 + 107.990) = 106.140 gm
The fourth was greater than the fifth by 0.004 gm
∴ The fifth
=(106.140−0.004)× ==53.068 gm
Hence, the fourth = 53.068 + 0.004 = 53.072 gm