Question
From a barrel that contains pure alcohol, 10% alcohol is
withdrawn and replaced with water. If the same process is repeated once more, then the quantity of alcohol remaining in the mixture would be 81 litres. Find the final quantity of water in the barrel.Solution
ATQ, Let the initial quantity of alcohol in the barrel be '100x' litres ATQ; 100x X (0.90)² = 81 Or, 81x = 81 Or, x = 1 So, original quantity of alcohol in the barrel = 100 X 1 = 100 litres Required quantity of water = 100 - 81 = 19 litres
125% of 88 ÷ 44 × 48 × 8 = ? × √125
A shopkeeper bought two articles for Rs. 600 each. If he sold one of them at 40% profit and the other at 25% loss, then find the difference between the ...
In a class, 70% of the students are adults, and 40% of the adults are females. If the number of adult males in the class is 105, ...
Find the area enclosed between the curves y=(x−4)2 and y=16−x2over their intersection interval.
A traveller travels from one place to another at a speed of y km/h and reaches the destination in 4 hours. If the same traveller had traveled 1 km/h fas...
- The average weight of 6 students in a group is 45 kg. If one student is replaced by person 'B', the average weight of the group increases by 5%. Find the d...
A doctor knows that 90% of patients have flu and 10% have allergy. Rash appears in 8% of flu patients and in 95% of allergic ones. If a patient shows r...
? = 234.87 + 32.14% of (59.88 x 70.04)
If A is a 3 × 3 matrix such that det (2A) = 64, then det A=?"Arjun" can complete a task on his own in 20 days. "Bhuvan" requires 5 days more than "Chirag" to finish the same task, where "Ch...
Relevant for Exams:
