For the following questions answer them individually
A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h.
Find the speed (in km/h) of the boat in still water.
What is the compound interest on a sum of ₹25,000 after three years at a rate of 12 per cent per annum interest compounded yearly?
The LCM of $$x^{2} − 8x + 15$$ and $$x^{2} − 5x + 6$$ is:
The cost of 3 kg of rice is ₹180. The cost of 8 kg of rice is equal to that of 5 kg of pulse. The cost of 15 kg of pulses is equal to that of 2 kg of tea. The cost of 3 kg of tea is equal to that of 6 kg of walnuts. What is the cost (in ₹) of 10 kg of walnuts?
What is the ratio of the simple interest earned on a certain amount at the rate of 21% per annum for 8 years to that earned on the same sum at the same rate for 21 years?
Select the INCORRECT formula from the following options.
Find the standard deviation of the following data (rounded off to two decimal places).
5, 3, 4, 7
Suresh, Dinesh and Ramesh became partners in a business by investing money in the ratio of 3 : 6 : 8. If their investments is increased by 5%, 15% and 20%, respectively, then what will be the ratio of their profits for one year?
The ratio of marks obtained by Rajesh, Rakesh and Ramesh in an exam is 2 : 4 : 9.
What are the marks obtained by Rakesh and Ramesh, if Rajesh scored 30 marks in the exam?
The average of 20 numbers is 32. If two numbers are 29 and 31, then what is the average of the remaining numbers (correct up to two decimals)?
