A) 20.48
B) 20
C) 19.48
D) 21.58
Correct Answer: A
Solution :
Rule After n such operations. Milk left in vessel after nth operation. = Whole quantity of milk in vessel \[x\left( \frac{x-y}{x} \right)n\]where x = total milk y = quantity of milk withdrawn. Here, x = 40, y = 8, n = 3 \[\therefore \] Required answer \[={{\left( \frac{40-8}{40} \right)}^{3}}\times 40\] \[={{\left( \frac{4}{5} \right)}^{3}}\times 40=\frac{64}{125}\times 40\] = 20.48 LYou need to login to perform this action.
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