For the following questions answer them individually
The speed of a boat in still water is 16 km/h, the time taken by the boat to cover a distance of 18 km upstream is equal to the time taken by the boat to travel 30Km downstream. What is the speed of the stream?
In a housing society, the ratio of two-wheelers to four-wheelers is 11 : 9. Among the four-wheelers, one-fourth are petrol vehicles and the remaining 81 are diesel vehicles. How many two-wheelers are there in this housing society?
Two right circular cones of equal volumes have their heights in the ratio 4 : 9. What is the ratio of the radii of their bases, the cones coming in the same order as that in which the ratio of their heights is given?
Find the area of a trapezium whose parallel sides are of length 15 cm and 20 cm, respectively, and whose distance between the parallel sides is 12 cm.
A can do a piece of work alone in 12 days. B is 20% more efficient than A, and C is 25% more efficient than B. In how many days can B and C together complete the work?
What approximate value should come in the place of the question mark'?' in the following equation?
$$305.03 + 61.09 \times 11.47 = ?$$
The value of $$\left\{(0.51)^{3} + (0.49)^{3}\right\} \div \left\{(0.51)^{2} -0.2499 + (0.49)^{2}\right\}$$ is:
A car travels the first half of a journey at a speed of 80 km/h and the next half of the journey at 100 km/h. What is the average speed of the car? [Give your answer correct to 2 places of decimal.]
The average age of 24 students in a class is 15 years. When the teacher's age is included, the average increases by 1.
What is the teacher's age (in years)?
Find the rate of simple interest per annum at which a sum of ₹1,200 will amount ₹1,800 in 4 years.
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