Loss on 1 bag grey cement bag = Rs -5
Loss on 6400 bag grey cement =Rs -5 × 6400 = Rs -32000
Let number of bags of white cement = n
profit on 1 bag white cement = Rs 8
Profit on n bags white cement = Rs 8n
∴ Total profit / loss = 0
Total profit + Total loss = 0
8n + (-32000) = 0
8n – 32000 = 0
⇒ 8n = 32000
n = \(\frac{8000}{8}\)
n = 4000
∴ Number of white cement bags = n = 4000