alleryA 100-litre tank contains milk. 10 litres are drawn out and replaced with water. This is done 3 times. How much milk remains?
A$72.9$ litres
B$70$ litres
C$75$ litres
D$80$ litres
Answer & Solution
Correct answer: A. $72.9$ litres
After n replacements of x out of V: milk = V × (1 − x/V)^n = 100 × (0.9)³ = 100 × 0.729 = 72.9 litres.
Keep practising Ratio and Proportion
Browse all Ratio and Proportion questions for CAT, or explore more Quantitative Reasoning topics.
Related questions
In a 200-metre race, A beats B by 20 metres. What is the ratio of A's speed to B's speed?Speed and time are __________ proportional for a fixed distance.A vendor mixes ₹40/kg rice with ₹60/kg rice to sell at ₹52/kg. What is the ratio of cheap If a:b = 3:2, what is (a+b)/(a−b)?The sides of two cubes are in the ratio 2:3. What is the ratio of their VOLUMES?₹8400 is divided among A, B, C in the ratio 3:4:5. What is B's share?A recipe uses dal and rice in the ratio 2:5. If 35 cups of rice are used, how many cups of₹$5400$ is divided among A, B and C in the ratio $3 : 5 : 7$. How much does B receive?